trees: add UPDATED_SUBMODULES to coreboot make

we do not want submodules to be downloaded after the fact.

we only handle this on ./update trees -f coreboot

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/trees

@@ -213,6 +213,9 @@ run_make_command()
 	[ "$project" = "coreboot" ] && [ -z "$mode" ] && x_ \
 		printf "%s\n" "${version%%-*}" > "$codedir/.coreboot-version"
 
+	[ "$project" = "coreboot" ] && \
+		makeargs="$makeargs UPDATED_SUBMODULES=1"
+
 	make -C "$codedir" $mode -j$threads $makeargs || \
 	    $err "run_make $codedir: !make $mode"