[MIPS] Do not use -msym32 option for modules.

On 64-bit kernel, modules are loaded into XKSEG for now.  While XKSEG
address is not a sign-extended 32-bit address, we can not use -msym32
option.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Makefile

@@ -63,7 +63,9 @@ cflags-y		+= -mabi=64
 ifdef CONFIG_BUILD_ELF64
 cflags-y		+= $(call cc-option,-mno-explicit-relocs)
 else
-cflags-y		+= $(call cc-option,-msym32)
+# -msym32 can not be used for modules since they are loaded into XKSEG
+CFLAGS_MODULE		+= $(call cc-option,-mno-explicit-relocs)
+CFLAGS_KERNEL		+= $(call cc-option,-msym32)
 endif
 endif