cbfs: Stop checking master header

The CBFS master header is a legacy structure that just conveys the same
information we already have from the FMAP these days. We're still
including it to support older CBFS implementations in some payloads, but
there's no need for coreboot itself to follow this indirection anymore.
This patch simplifies the default CBFS locator to just return the CBFS
offset and size from the FMAP directly.

Change-Id: I6b00dd7f276364d62fa1f637efbaee0e80607c49
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36688
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/cbfs.h

@@ -74,7 +74,7 @@ struct cbfs_props {
 };
 
 /* Default CBFS locator .locate() callback that locates "COREBOOT" region. */
-int cbfs_master_header_props(struct cbfs_props *props);
+int cbfs_default_props(struct cbfs_props *props);
 
 /* Return < 0 on error otherwise props are filled out accordingly. */
 int cbfs_boot_region_properties(struct cbfs_props *props);