config/arch: always select the adequate bitness

Even if the selected ARCH does not support different bitness (or we do
not support building with another bitness), still select the appropriate
bitness.

config/arch/alpha.in

@@ -1,6 +1,8 @@
 # Alpha specific configuration file
 
 config ARCH_alpha
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
     select ARCH_USE_MMU
     select ARCH_SUPPORT_CPU
     select ARCH_SUPPORT_TUNE

config/arch/arm.in

@@ -1,6 +1,8 @@
 # ARM specific configuration file
 
 config ARCH_arm
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
     select ARCH_SUPPORTS_BOTH_MMU
     select ARCH_DEFAULT_HAS_MMU
     select ARCH_SUPPORTS_BOTH_ENDIAN

config/arch/avr32.in

@@ -2,6 +2,8 @@
 # depends on EXPERIMENTAL
 
 config ARCH_avr32
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
     select ARCH_USE_MMU
     select ARCH_DEFAULT_BE
     select ARCH_SUPPORT_ARCH

config/arch/ia64.in

@@ -3,6 +3,7 @@
 
 config ARCH_ia64
     select ARCH_SUPPORTS_64
+    select ARCH_DEFAULT_64
     select ARCH_USE_MMU
     select ARCH_SUPPORTS_BOTH_ENDIAN
     help

config/arch/mips.in

@@ -1,6 +1,8 @@
 # MIPS specific config options
 
 config ARCH_mips
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
     select ARCH_USE_MMU
     select ARCH_SUPPORTS_BOTH_ENDIAN
     select ARCH_DEFAULT_BE

config/arch/sh.in

@@ -2,6 +2,8 @@
 # depends on EXPERIMENTAL
 
 config ARCH_sh
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
     select ARCH_USE_MMU
     select ARCH_SUPPORTS_BOTH_ENDIAN
     select ARCH_DEFAULT_LE