led: leds-qpnp-flash: set OTG pulse skip bit around LED usage

When device is used as OTG mode and after flash LED, USB client
is not able to work properly as flash LED causes voltage dip on VBUS
line. Setting OTG pulse enablement skip solves this problem.

Change-Id: Id5473103ff021e348c895fed5b41218cde231007
Signed-off-by: Chun Zhang <chunz@codeaurora.org>
Signed-off-by: Jigarkumar Kishorkumar Zala <j_zala@codeaurora.org>