feat(ci): always pass -j to tfa make commands

There are a few ways to build tfa in CI, not all of which get a -j
argument. Pass it for consistency and speed when available.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Id42088c2ba0ff85422cf466b431040ea12d77c57
1 file changed