vboot: Separate vboot from chromeos

VBOOT_VERIFY_FIRMWARE should be independent of CHROMEOS. This allows use
of verified boot library without having to stick to CHROMEOS.

BUG=chrome-os-partner:55639

Change-Id: Ia2c328712caedd230ab295b8a613e3c1ed1532d9
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15867
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/lib/cbfs.c

@@ -269,7 +269,7 @@ const struct cbfs_locator __attribute__((weak)) cbfs_master_header_locator = {
 extern const struct cbfs_locator vboot_locator;
 
 static const struct cbfs_locator *locators[] = {
-#if CONFIG_VBOOT_VERIFY_FIRMWARE
+#if CONFIG_VBOOT
 	&vboot_locator,
 #endif
 	&cbfs_master_header_locator,