Tegra30: MMC: Enable DT MMC driver support for Tegra30 Cardhu boards

Tested on my Cardhu-A04 tablet, eMMC and SD-Card work fine, can load
a kernel off of an SD card OK, card detect works, and the env is now
stored in eMMC (end of the 2nd 'boot' sector, same as Tegra20).
Signed-off-by: NTom Warren <twarren@nvidia.com>
Reviewed-by: NStephen Warren <swarren@nvidia.com>

include/configs/cardhu.h

@@ -47,7 +47,25 @@
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_CMD_I2C
 
-#define CONFIG_ENV_IS_NOWHERE
+/* SD/MMC */
+#define CONFIG_MMC
+#define CONFIG_GENERIC_MMC
+#define CONFIG_TEGRA_MMC
+#define CONFIG_CMD_MMC
+
+#define CONFIG_DOS_PARTITION
+#define CONFIG_EFI_PARTITION
+#define CONFIG_FS_EXT4
+#define CONFIG_FS_FAT
+#define CONFIG_CMD_EXT2
+#define CONFIG_CMD_FAT
+#define CONFIG_CMD_FS_GENERIC
+
+/* Environment in eMMC, at the end of 2nd "boot sector" */
+#define CONFIG_ENV_IS_IN_MMC
+#define CONFIG_ENV_OFFSET		((512 * 1024) - CONFIG_ENV_SIZE)
+#define CONFIG_SYS_MMC_ENV_DEV		0
+#define CONFIG_SYS_MMC_ENV_PART		2
 
 /* SPI */
 #define CONFIG_TEGRA_SLINK

include/configs/tegra30-common.h

@@ -86,4 +86,7 @@
 /* Total I2C ports on Tegra30 */
 #define TEGRA_I2C_NUM_CONTROLLERS	5
 
+/* Misc utility code */
+#define CONFIG_BOUNCE_BUFFER
+
 #endif /* _TEGRA30_COMMON_H_ */