meta-bletchley: motor-ctrl: Make init services auto start

We want to do  motor-init and turn on ac when system boot-up,

make service instances link under /lib/systemd/system/multi-user.target.wants/

Change-Id: I53bc97270d111b90e0d70052f81a7e428805ead1
Signed-off-by: Allen.Wang <Allen_Wang@quantatw.com>