leds: qpnp: Add snapshot of vibrator LDO driver

This is a snapshot of the vibrator LDO driver as of msm-4.19
'commit c527cd5c987ac (Merge "mhi: cntrl: qcom: allow printing
large strings to IPC logs")' with the following modifications:
	- Replace snprintf with scnprintf.

Change-Id: Id58fbcc33607c309366104fe72282c09c86a3227
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>