drivers/dma/: Use the ccflag-y instead of EXTRA_CFLAGS

Use the ccflag-y flag instead of EXTRA_CFLAGS because EXTRA_CFLAGS is
deprecated and should now be switched. According to (documentation/kbuild/makefiles.txt).
Signed-off-by: NTracey Dent <tdent48227@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/dma/Makefile

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