util/abuild: When using blobs, enable 3rdparty/fsp by default

This is a no-op on non-FSP systems, but enables using it when supported.

Change-Id: I66fe9b8587753ea017e13a752a7728e47287e9a0
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/28776
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

util/abuild/abuild

@@ -696,7 +696,7 @@ while true ; do
 			shift;;
 		-B|--blobs)	shift
 			customizing="${customizing}, blobs"
-			configoptions="${configoptions}CONFIG_USE_BLOBS=y\n"
+			configoptions="${configoptions}CONFIG_USE_BLOBS=y\nCONFIG_ADD_FSP_BINARIES=y\nCONFIG_FSP_USE_REPO=y\n"
 			;;
 		-A|--any-toolchain)	shift
 			customizing="${customizing}, any-toolchain"