bsp: valleyisland: add dma support

This patch enable DMA for valleyisland for both 32-bit and 64-bit system.

Signed-off-by: Chai, Chong Yi <chong.yi.chai@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

bsp/valleyisland/valleyisland.cfg

@@ -72,3 +72,8 @@ CONFIG_RTC_DRV_CMOS=y
 
 # Ethernet support
 CONFIG_R8169=m
+
+# DMA support
+CONFIG_DW_DMAC_CORE=y
+CONFIG_DW_DMAC=y
+CONFIG_DW_DMAC_PCI=y