leds: vibrator: Add snapshot of vibrator driver

Add snapshot of leds-qpnp-vibrator.c as of msm-4.9 commit
d622c74d02c2 ("leds: qpnp-vibrator: Add vibrator set state function").

Change-Id: Iaea20f0b0a80c937c870dc7336a1626ef7295934
Signed-off-by: Shilpa Suresh <sbsure@codeaurora.org>