post_code: add post code for invalid vendor binary

Add a new post code POST_INVALID_VENDOR_BINARY, used when coreboot fails
to locate or validate a vendor supplied binary.

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

Change-Id: Ib1e359d4e8772c37922b1b779135e58c73bff6b4
Signed-off-by: Keith Short <keithshort@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32772
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/Documentation/POSTCODES b/Documentation/POSTCODES
index 162e863..855940f 100644
--- a/Documentation/POSTCODES
+++ b/Documentation/POSTCODES
@@ -18,6 +18,7 @@
 0x89 Devices have been enabled
 0xe0 Boot media (e.g. SPI ROM) is corrupt
 0xe1 Resource stored within CBFS is corrupt
+0xe2 Vendor binary (e.g. FSP) generated a fatal error
 0xf8 Entry into elf boot
 0xf3 Jumping to payload