tegra: cros_ec: Add tegra support for Chrome OS EC

This requires a change to stdin to include the 'cros-ec-keyb' input device.
Put this in the common file, enabled by the relevant CONFIG.

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

include/configs/tegra-common-post.h

@@ -40,8 +40,14 @@
 #define STDOUT_LCD ""
 #endif
 
+#ifdef CONFIG_CROS_EC_KEYB
+#define STDOUT_CROS_EC	",cros-ec-keyb"
+#else
+#define STDOUT_CROS_EC	""
+#endif
+
 #define TEGRA_DEVICE_SETTINGS \
-	"stdin=serial" STDIN_KBD_KBC STDIN_KBD_USB "\0" \
+	"stdin=serial" STDIN_KBD_KBC STDIN_KBD_USB STDOUT_CROS_EC "\0" \
 	"stdout=serial" STDOUT_LCD "\0" \
 	"stderr=serial" STDOUT_LCD "\0" \
 	""