tegra: config: Allow Chrome OS environment settings to be included

Bring these in if they are provided by the board.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

include/configs/tegra-common-post.h

@@ -58,13 +58,18 @@
 
 #define CONFIG_SYS_LOAD_ADDR CONFIG_LOADADDR
 
+#ifndef CONFIG_CHROMEOS_EXTRA_ENV_SETTINGS
+#define CONFIG_CHROMEOS_EXTRA_ENV_SETTINGS
+#endif
+
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	TEGRA_DEVICE_SETTINGS \
 	MEM_LAYOUT_ENV_SETTINGS \
 	"fdt_high=ffffffff\0" \
 	"initrd_high=ffffffff\0" \
 	BOOTENV \
-	BOARD_EXTRA_ENV_SETTINGS
+	BOARD_EXTRA_ENV_SETTINGS \
+	CONFIG_CHROMEOS_EXTRA_ENV_SETTINGS
 
 #if defined(CONFIG_TEGRA20_SFLASH) || defined(CONFIG_TEGRA20_SLINK) || defined(CONFIG_TEGRA114_SPI)
 #define CONFIG_TEGRA_SPI