regulator: qpnp-lcdb: Disable step voltage ramp for PM8150L V3

The S/W work around to program the LCDB voltage in 500 mV steps
is required only for PM8150L version < V3. So, ignore this W/A
for the PM8150L V3 and above.

Change-Id: Iaaf15062a19c5f6ae492f949d721a991e5b46669
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>