Unset CONFIG_STRICT_KERNEL_RWX in kernel configuration

This will reduce kernel size from ~21MiB to ~5MiB as it removes
huge alignment sections in the linker script.
For details, see symbol SECTION_ALIGN in

arch/riscv/include/asm/set_memory.h

and

arch/riscv/kernel/vmlinux.lds.S

It should be noted, however, that this might trade kernel binary load
size for security in some settings.

Author: onnokort

configs/linux.config

@@ -325,7 +325,7 @@ CONFIG_COMPAT_32BIT_TIME=y
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX=y
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT=y
 CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
-CONFIG_STRICT_KERNEL_RWX=y
+CONFIG_STRICT_KERNEL_RWX=n
 CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
 CONFIG_STRICT_MODULE_RWX=y
 # CONFIG_LOCK_EVENT_COUNTS is not set