leds: leds-qpnp-flash: reset module after flash LED ramp down

Deset bit for FOLLOW_OTST2_RB when MASK3 module is enabled, in
order to prevent device reset before flash LED will get a chance
to ramp down.

Change-Id: I1c77529a1aefeaf68c762ae6755d75d8dceab08e
Signed-off-by: Jigarkumar Kishorkumar Zala <j_zala@codeaurora.org>