vboot/ui: map Ctrl+S to the TO_NORM screen

Add hotkey to simplify FAFT mode_switcher for new Groot UI.

BUG=b:146399181
TEST=make clean && make runtests
BRANCH=none

Change-Id: I91e00c5365c8f5a587786ab7dcfa67765a342824
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2213384
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
diff --git a/firmware/2lib/2ui.c b/firmware/2lib/2ui.c
index c0b527b..14507ec 100644
--- a/firmware/2lib/2ui.c
+++ b/firmware/2lib/2ui.c
@@ -284,6 +284,8 @@
 vb2_error_t developer_action(struct vb2_ui_context *ui)
 {
 	/* Developer mode keyboard shortcuts */
+	if (ui->key == VB_KEY_CTRL('S'))
+		return vb2_ui_change_screen(ui, VB2_SCREEN_DEVELOPER_TO_NORM);
 	if (ui->key == VB_KEY_CTRL('U') ||
 	    (DETACHABLE && ui->key == VB_BUTTON_VOL_UP_LONG_PRESS))
 		return vb2_ui_developer_mode_boot_external_action(ui);