tegra: Enable driver model

Enable driver model for Tegra boards.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NStephen Warren <swarren@nvidia.com>

include/configs/tegra-common.h

@@ -19,6 +19,9 @@
 
 #include <asm/arch/tegra.h>		/* get chip and board defs */
 
+#define CONFIG_DM
+#define CONFIG_CMD_DM
+
 #define CONFIG_SYS_TIMER_RATE		1000000
 #define CONFIG_SYS_TIMER_COUNTER	NV_PA_TMRUS_BASE