leds: qpnp: Add snapshot of vibrator LDO for lito

This is a snapshot of the vibrator LDO driver as of msm-4.14
'commit Ib18fb4bdb6e (Merged "leds: qpnp: add driver file for
configuring vibrator LDO")'.

Change-Id: Idacee8de9e145b0b569912870c79ccb87b5a4ac6
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>