generic: 6.6: remove kernel export stripping patch

Our kernel export stripping has been broken on 6.6 from the start since
upstream kernel really reworked stuff in ("kbuild: generate KSYMTAB entries
by modpost") and other commits as well.

So, until this is either fixed or reworked lets drop the patch as it doesnt
make sense to carry it knowing its broken and it can always be easily
restored.

Link: https://github.com/openwrt/openwrt/pull/15498
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/generic/hack-6.6/221-module_exports.patch

@@ -1,102 +0,0 @@
-From b14784e7883390c20ed3ff904892255404a5914b Mon Sep 17 00:00:00 2001
-From: Felix Fietkau <nbd@nbd.name>
-Date: Fri, 7 Jul 2017 17:05:53 +0200
-Subject: add an optional config option for stripping all unnecessary symbol exports from the kernel image
-
-lede-commit: bb5a40c64b7c4f4848509fa0a6625055fc9e66cc
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
- include/asm-generic/vmlinux.lds.h | 18 +++++++++++++++---
- include/linux/export.h            |  9 ++++++++-
- scripts/Makefile.build            |  2 +-
- 3 files changed, 24 insertions(+), 5 deletions(-)
-
---- a/include/asm-generic/vmlinux.lds.h
-+++ b/include/asm-generic/vmlinux.lds.h
-@@ -81,6 +81,16 @@
- #define RO_EXCEPTION_TABLE
- #endif
- 
-+#ifndef SYMTAB_KEEP
-+#define SYMTAB_KEEP KEEP(*(SORT(___ksymtab+*)))
-+#define SYMTAB_KEEP_GPL KEEP(*(SORT(___ksymtab_gpl+*)))
-+#endif
-+
-+#ifndef SYMTAB_DISCARD
-+#define SYMTAB_DISCARD
-+#define SYMTAB_DISCARD_GPL
-+#endif
-+
- /* Align . function alignment. */
- #define ALIGN_FUNCTION()  . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
- 
-@@ -486,14 +496,14 @@
- 	/* Kernel symbol table: Normal symbols */			\
- 	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
- 		__start___ksymtab = .;					\
--		KEEP(*(SORT(___ksymtab+*)))				\
-+		SYMTAB_KEEP						\
- 		__stop___ksymtab = .;					\
- 	}								\
- 									\
- 	/* Kernel symbol table: GPL-only symbols */			\
- 	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
- 		__start___ksymtab_gpl = .;				\
--		KEEP(*(SORT(___ksymtab_gpl+*)))				\
-+		SYMTAB_KEEP_GPL						\
- 		__stop___ksymtab_gpl = .;				\
- 	}								\
- 									\
-@@ -513,7 +523,7 @@
- 									\
- 	/* Kernel symbol table: strings */				\
-         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
--		*(__ksymtab_strings)					\
-+		*(__ksymtab_strings+*)					\
- 	}								\
- 									\
- 	/* __*init sections */						\
-@@ -1000,6 +1010,8 @@
- #define COMMON_DISCARDS							\
- 	SANITIZER_DISCARDS						\
- 	PATCHABLE_DISCARDS						\
-+	SYMTAB_DISCARD							\
-+	SYMTAB_DISCARD_GPL						\
- 	*(.discard)							\
- 	*(.discard.*)							\
- 	*(.export_symbol)						\
---- a/include/linux/export-internal.h
-+++ b/include/linux/export-internal.h
-@@ -26,6 +26,12 @@
- #define __KSYM_REF(sym)		".long " #sym
- #endif
- 
-+#ifdef MODULE
-+#define __EXPORT_SUFFIX(sym)
-+#else
-+#define __EXPORT_SUFFIX(sym) "+" #sym
-+#endif
-+
- /*
-  * For every exported symbol, do the following:
-  *
-@@ -38,7 +44,7 @@
-  * former apparently works on all arches according to the binutils source.
-  */
- #define __KSYMTAB(name, sym, sec, ns)						\
--	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1"	"\n"	\
-+	asm("	.section \"__ksymtab_strings" __EXPORT_SUFFIX(sym) "\",\"aMS\",%progbits,1"	"\n"	\
- 	    "__kstrtab_" #name ":"					"\n"	\
- 	    "	.asciz \"" #name "\""					"\n"	\
- 	    "__kstrtabns_" #name ":"					"\n"	\
---- a/scripts/Makefile.build
-+++ b/scripts/Makefile.build
-@@ -366,7 +366,7 @@ targets += $(real-dtb-y) $(lib-y) $(alwa
- # Linker scripts preprocessor (.lds.S -> .lds)
- # ---------------------------------------------------------------------------
- quiet_cmd_cpp_lds_S = LDS     $@
--      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
-+      cmd_cpp_lds_S = $(CPP) $(EXTRA_LDSFLAGS) $(cpp_flags) -P -U$(ARCH) \
- 	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
- 
- $(obj)/%.lds: $(src)/%.lds.S FORCE