Comcerto: Enable ZONE_DMA

Use a normal ZONE_DMA when CONFIG_COMERTO_ZONE_DMA_NCNB is not
enabled.

Change-Id: I99a581b7fdc12f892086a8e7b890394dc7913f24
Google-Bug-Id: 24673305
diff --git a/arch/arm/mach-comcerto/Kconfig b/arch/arm/mach-comcerto/Kconfig
index 84098f0..0a8d2fd 100644
--- a/arch/arm/mach-comcerto/Kconfig
+++ b/arch/arm/mach-comcerto/Kconfig
@@ -30,6 +30,7 @@
 	select GENERIC_CLOCKEVENTS
 	select HAVE_SCHED_CLOCK
 	select COMCERTO_DW_DMA_SUPPORT
+	select ZONE_DMA
 	select CLKDEV_LOOKUP
 	select ARCH_HAS_CPUFREQ
 	select ARCH_HAS_OPP
@@ -220,7 +221,7 @@
 
 config COMCERTO_ZONE_DMA_NCNB
 	bool "Comcerto Zone DMA"
-	select ZONE_DMA
+	depends on ZONE_DMA
 	default n
 
 config COMCERTO_CUSTOM_SKB_LAYOUT