xtensa: remove meaningless export ccflags-y

arch/xtensa/boot/Makefile does not define ccflags-y at all.

Please do not export ccflags-y because it is meant to be effective
only in the current Makefile.

Signed-off-by: Masahiro Yamada <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Max Filippov <[email protected]>

Author: masahir0y

arch/xtensa/boot/Makefile

@@ -14,7 +14,6 @@ HOSTFLAGS	+= -Iarch/$(ARCH)/boot/include
 
 BIG_ENDIAN	:= $(shell echo __XTENSA_EB__ | $(CC) -E - | grep -v "\#")
 
-export ccflags-y
 export BIG_ENDIAN
 
 subdir-y	:= lib