post_code: add post code for video initialization failure

Add a new post code POST_VIDEO_FAILURE used when the Intel FSP silicon
initialization returns an error when graphics was also initialized.

BUG=b:124401932
BRANCH=sarien
TEST=build coreboot for sarien and arcada platforms

Change-Id: Ibc7f7defbed34038f445949010a37c8e368aae20
Signed-off-by: Keith Short <keithshort@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32775
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/Documentation/POSTCODES b/Documentation/POSTCODES
index a9d392a..0e67dd1 100644
--- a/Documentation/POSTCODES
+++ b/Documentation/POSTCODES
@@ -21,6 +21,7 @@
 0xe2 Vendor binary (e.g. FSP) generated a fatal error
 0xe3 RAM could not be initialized
 0xe4 Critical hardware component could not initialize
+0xe5 Video subsystem failed to initialize
 0xf8 Entry into elf boot
 0xf3 Jumping to payload