[MIPS] Kill redundant EXTRA_AFLAGS

Kill redundant EXTRA_AFLAGS added after the commit
d2af363cfb94f1bacb3e60327bc44a97881a38c2.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/lemote/lm2e/Makefile

@@ -4,5 +4,4 @@
 
 obj-y += setup.o prom.o reset.o irq.o pci.o bonito-irq.o dbg_io.o mem.o
 
-EXTRA_AFLAGS := $(CFLAGS)
 EXTRA_CFLAGS += -Werror

arch/mips/sibyte/common/Makefile

@@ -2,5 +2,4 @@ obj-y :=
 
 obj-$(CONFIG_SIBYTE_TBPROF)		+= sb_tbprof.o
 
-EXTRA_AFLAGS := $(CFLAGS)
 EXTRA_CFLAGS += -Werror