microblaze: change to new flag variable

Replace EXTRA_CFLAGS with ccflags-y.
Signed-off-by: Nmatt mooney <mfm@muteddisk.com>
Acked-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NMichal Marek <mmarek@suse.cz>

arch/microblaze/kernel/cpu/Makefile

@@ -6,7 +6,7 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_cache.o = -pg
 endif
 
-EXTRA_CFLAGS += -DCPU_MAJOR=$(CPU_MAJOR) -DCPU_MINOR=$(CPU_MINOR) \
+ccflags-y := -DCPU_MAJOR=$(CPU_MAJOR) -DCPU_MINOR=$(CPU_MINOR) \
 		-DCPU_REV=$(CPU_REV)
 
 obj-y += cache.o cpuinfo.o cpuinfo-pvr-full.o cpuinfo-static.o mb.o pvr.o