dma: 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>

drivers/dma/Makefile

-ifeq ($(CONFIG_DMADEVICES_DEBUG),y)
-	ccflags-y	+= -DDEBUG
-endif
-ifeq ($(CONFIG_DMADEVICES_VDEBUG),y)
-	ccflags-y	+= -DVERBOSE_DEBUG
-endif
+ccflags-$(CONFIG_DMADEVICES_DEBUG)  := -DDEBUG
+ccflags-$(CONFIG_DMADEVICES_VDEBUG) += -DVERBOSE_DEBUG
 
 obj-$(CONFIG_DMA_ENGINE) += dmaengine.o
 obj-$(CONFIG_NET_DMA) += iovlock.o