ARM: tegra: config: enable dmaengine based APB DMA driver

Enable config for dmaengine based Tegra APB DMA driver and
disable the legacy APB DMA driver (SYSTEM_DMA).

[swarren: removed CONFIG_TEGRA_SYSTEM_DMA not set line, since the option
is removed entirely in a later patch]
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/configs/tegra_defconfig

@@ -145,6 +145,8 @@ CONFIG_MMC_SDHCI_TEGRA=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EM3027=y
 CONFIG_RTC_DRV_TEGRA=y
+CONFIG_DMADEVICES=y
+CONFIG_TEGRA20_APB_DMA=y
 CONFIG_STAGING=y
 CONFIG_SENSORS_ISL29018=y
 CONFIG_SENSORS_ISL29028=y