configs: tegra-common-post: add GPIO keyboard as STDIN device

GPIO keyboard is used on many newly upstreamed devices.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS Grouper E1565
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h
index 991ffbb..2d50956 100644
--- a/include/configs/tegra-common-post.h
+++ b/include/configs/tegra-common-post.h
@@ -35,6 +35,12 @@
 #define STDIN_KBD_USB ""
 #endif
 
+#ifdef CONFIG_BUTTON_KEYBOARD
+#define STDIN_BTN_KBD ",button-kbd"
+#else
+#define STDIN_BTN_KBD ""
+#endif
+
 #ifdef CONFIG_VIDEO
 #define STDOUT_VIDEO ",vidconsole"
 #else
@@ -48,7 +54,7 @@
 #endif
 
 #define TEGRA_DEVICE_SETTINGS \
-	"stdin=serial" STDIN_KBD_KBC STDIN_KBD_USB STDOUT_CROS_EC "\0" \
+	"stdin=serial" STDIN_KBD_KBC STDIN_KBD_USB STDOUT_CROS_EC STDIN_BTN_KBD "\0" \
 	"stdout=serial" STDOUT_VIDEO "\0" \
 	"stderr=serial" STDOUT_VIDEO "\0" \
 	""