Use makeparallel to propagate -j flag to ninja or kati

When USE_NINJA=true is set, use makeparallel to claim all jobs from make and
pass them to ninja with -j.  If USE_GOMA is set, pass the -j flag to
kati instead so the parallelism can be set in the local_pool instead.

Change-Id: I6e4f957c65683b74533ecb6d33e25de858922823