pine64-pinephone: add vibration when booting

Icenowy Zheng authored 5 years ago and Bart Ribbers committed 5 years ago

Add a vibration feedback, along with the LED feedback when booting.
This is suggested by TL Lim.

When trying to power up the phone with holding it in the hand, vibration
feedback is more obvious than LED.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>