Comcerto: Only change text offset when DMA NCNB is enabled

Change-Id: I7a6b54a9b9938b71e63312ad090e37ae8a4a211b
Google-Bug-Id: 24673305
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 8fd3623..11aa00c 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -141,7 +141,7 @@
 machine-$(CONFIG_ARCH_CNS3XXX)		:= cns3xxx
 machine-$(CONFIG_ARCH_COMCERTO)         := comcerto
 ifeq ($(CONFIG_ARCH_COMCERTO),y)
-textofs-$(CONFIG_ZONE_DMA) := 0x04008000
+textofs-$(CONFIG_COMCERTO_ZONE_DMA_NCNB) := 0x04008000
 endif
 machine-$(CONFIG_ARCH_DAVINCI)		:= davinci
 machine-$(CONFIG_ARCH_DOVE)		:= dove