kernel: change to new flag variable

Replace EXTRA_CFLAGS with ccflags-y.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index c350e18..c5ebc6a 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,4 +1,5 @@
-ccflags-$(CONFIG_PM_DEBUG)	:=	-DDEBUG
+
+ccflags-$(CONFIG_PM_DEBUG)	:= -DDEBUG
 
 obj-$(CONFIG_PM)		+= main.o
 obj-$(CONFIG_PM_SLEEP)		+= console.o