powerpc/corenet32: enable DMA in defconfig

By default we enable DMA(CONFIG_FSL_DMA) support
which are needed on P2041RDB, P3041DS, P4080DS,
B4860QDS, etc.
Signed-off-by: NYuan Yao <yao.yuan@freescale.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/configs/corenet32_smp_defconfig

@@ -145,6 +145,8 @@ CONFIG_RTC_DRV_DS1307=y
 CONFIG_RTC_DRV_DS1374=y
 CONFIG_RTC_DRV_DS3232=y
 CONFIG_UIO=y
+CONFIG_DMADEVICES=y
+CONFIG_FSL_DMA=y
 CONFIG_VIRT_DRIVERS=y
 CONFIG_FSL_HV_MANAGER=y
 CONFIG_STAGING=y