ARM: tegra: enable I2C buses for P2771-0000

Enable I2C devices in DT and enable building tegra_i2c.c driver.

Signed-off-by: Bryan Wu <pengw@nvidia.com>
(swarren, commit msg rework, fixed DT node sort order)
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/p2771-0000.h b/include/configs/p2771-0000.h
index 257283f..3ce7208 100644
--- a/include/configs/p2771-0000.h
+++ b/include/configs/p2771-0000.h
@@ -14,6 +14,9 @@
 /* High-level configuration options */
 #define CONFIG_TEGRA_BOARD_STRING	"NVIDIA P2771-0000"
 
+/* I2C */
+#define CONFIG_SYS_I2C_TEGRA
+
 /* SD/MMC */
 #define CONFIG_MMC
 #define CONFIG_GENERIC_MMC