util/abuild/abuild: Do not check out submodules

This force-downloads the qc_blobs repository, whose license is then
automatically accepted. This may also cause race conditions with git.

Change-Id: Id760172289abbe4d5ad5f230c9f1d3e1ab3908ec
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45607
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/abuild/abuild

@@ -794,8 +794,6 @@ if [ "$cpus" != "1" ]; then
 	echo | xargs -P ${cpus:-0} -n 1 echo 2>/dev/null >/dev/null && USE_XARGS=1
 fi
 
-git submodule update --checkout --init
-
 if [ "$USE_XARGS" = "0" ]; then
 test "$MAKEFLAGS" == "" && test "$cpus" != "" && export MAKEFLAGS="-j $cpus"
 export MAKEFLAGS="$MAKEFLAGS UPDATED_SUBMODULES=1" # no need to re-download