zynq: kernel: use some configs provided by generic

- Select CONFIG_PREEMPT_NONE (server) instead
  of CONFIG_PREEMPT (low-latency desktop)
- Remove CONFIG_USELIB
- Remove CONFIG_SYSCTL_SYSCALL

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/zynq/config-4.19

@@ -512,17 +512,12 @@ CONFIG_POWER_RESET=y
 CONFIG_POWER_RESET_VEXPRESS=y
 CONFIG_POWER_SUPPLY=y
 CONFIG_PPS=y
-CONFIG_PREEMPT=y
-CONFIG_PREEMPT_COUNT=y
-# CONFIG_PREEMPT_NONE is not set
-CONFIG_PREEMPT_RCU=y
 CONFIG_PROC_EVENTS=y
 # CONFIG_PROC_STRIPPED is not set
 CONFIG_PTP_1588_CLOCK=y
 CONFIG_R8169=y
 CONFIG_RAS=y
 CONFIG_RATIONAL=y
-# CONFIG_RCU_BOOST is not set
 CONFIG_RCU_NEED_SEGCBLIST=y
 CONFIG_RCU_STALL_COMMON=y
 CONFIG_REALTEK_PHY=y
@@ -576,10 +571,8 @@ CONFIG_SUSPEND_FREEZER=y
 CONFIG_SWPHY=y
 CONFIG_SWP_EMULATE=y
 CONFIG_SYNC_FILE=y
-CONFIG_SYSCTL_SYSCALL=y
 CONFIG_SYSFS_SYSCALL=y
 CONFIG_SYS_SUPPORTS_APM_EMULATION=y
-CONFIG_TASKS_RCU=y
 # CONFIG_TCP_CONG_ADVANCED is not set
 # CONFIG_TEXTSEARCH is not set
 CONFIG_THERMAL=y
@@ -593,6 +586,7 @@ CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y
 # CONFIG_TMPFS_XATTR is not set
+CONFIG_TREE_RCU=y
 CONFIG_TREE_SRCU=y
 CONFIG_UIO=y
 # CONFIG_UIO_AEC is not set
@@ -605,7 +599,6 @@ CONFIG_UIO_PDRV_GENIRQ=y
 # CONFIG_UIO_PRUSS is not set
 # CONFIG_UIO_SERCOS3 is not set
 CONFIG_UNCOMPRESS_INCLUDE="debug/uncompress.h"
-CONFIG_UNINLINE_SPIN_UNLOCK=y
 CONFIG_USB=y
 CONFIG_USB_CHIPIDEA=y
 CONFIG_USB_CHIPIDEA_HOST=y
@@ -626,7 +619,6 @@ CONFIG_USB_SUPPORT=y
 CONFIG_USB_ULPI=y
 CONFIG_USB_ULPI_BUS=y
 CONFIG_USB_ULPI_VIEWPORT=y
-CONFIG_USELIB=y
 # CONFIG_USERIO is not set
 CONFIG_USE_OF=y
 CONFIG_VEXPRESS_CONFIG=y