stm32: Remove unnecessary kernel options

These options are filtered out since some weeks, remove them also from
the new stm32 target.

Fixes: 851e7f77e424 ("stm32: add new stm32 target")
Link: https://github.com/openwrt/openwrt/pull/17058
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit ea2c860225b8bbda98ed0526dc670825866835b6)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <[email protected]>

target/linux/stm32/stm32mp1/config-6.6

@@ -70,8 +70,6 @@ CONFIG_BOUNCE=y
 CONFIG_BUFFER_HEAD=y
 # CONFIG_CACHE_L2X0 is not set
 CONFIG_CC_HAVE_STACKPROTECTOR_TLS=y
-CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
-CONFIG_CC_NO_ARRAY_BOUNDS=y
 CONFIG_CHR_DEV_SG=y
 CONFIG_CLKSRC_MMIO=y
 CONFIG_CLKSRC_STM32=y
@@ -189,7 +187,6 @@ CONFIG_FUNCTION_ALIGNMENT=0
 CONFIG_FWNODE_MDIO=y
 CONFIG_FW_CACHE=y
 # CONFIG_FW_LOADER_USER_HELPER is not set
-CONFIG_GCC10_NO_ARRAY_BOUNDS=y
 CONFIG_GENERIC_ALLOCATOR=y
 CONFIG_GENERIC_ARCH_TOPOLOGY=y
 CONFIG_GENERIC_BUG=y