leds: leds-qpnp-flash: optimization of regulator data parsing

Optimization of regulator data parsing, and correct check
condition to query regulator data parsing and regulator setup
initialization.

Change-Id: I6448f8f481b54242e89e91218592a24c56f58828
Signed-off-by: Jigarkumar Kishorkumar Zala <j_zala@codeaurora.org>