feat(ci): don't force serial building with local checkouts

Tfa and tftf have been cleaned up. It is useful (and quicker!) to allow
it and now it is also safe.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I093ef488b58ad7a5219062a4a49dda4cbbeb6a0b
diff --git a/script/run_local_ci.sh b/script/run_local_ci.sh
index 0dbf8c5..fe54067 100755
--- a/script/run_local_ci.sh
+++ b/script/run_local_ci.sh
@@ -48,8 +48,7 @@
 
 EOF
 
-	# If we're using local checkouts for either TF or TFTF, we must
-	# serialise builds
+	# If serialized builds were requested
 	while [ "$i" -lt "$num" ]; do
 		{
 		printf "all: %04d_run %04d_build\n" "$i" "$i"
@@ -436,13 +435,6 @@
 source "$workspace/env"
 set +a
 
-if [ "$local_count" -gt 0 ]; then
-	# At least one repository is local
-	serialize_builds=1
-else
-	dont_clean=0
-fi
-
 export -f upon not_upon
 
 # Generate test descriptions