vboot: Add developer screens to vb2_screen

Add VB2_SCREEN_DEVELOPER_MODE and VB2_SCREEN_DEVELOPER_TO_NORM to enum vb2_screen.

BRANCH=none
BUG=b:146399181
TEST=USE="menu_ui" emerge-nami depthcharge

Change-Id: Ie949eedbf5d564f73fd6288bbc3630af83335dbb
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2186571
Reviewed-by: Joel Kitching <kitching@chromium.org>
diff --git a/firmware/2lib/include/2api.h b/firmware/2lib/include/2api.h
index 6b51c54..e33d6bd 100644
--- a/firmware/2lib/include/2api.h
+++ b/firmware/2lib/include/2api.h
@@ -1189,6 +1189,10 @@
 	VB2_SCREEN_RECOVERY_DISK_STEP3		= 0x212,
 	/* Recovery using phone */
 	VB2_SCREEN_RECOVERY_PHONE_STEP1		= 0x220,
+	/* Developer screen */
+	VB2_SCREEN_DEVELOPER_MODE		= 0x300,
+	/* Confirm transition to normal mode */
+	VB2_SCREEN_DEVELOPER_TO_NORM		= 0x310,
 };
 
 /**