leds: leds-qpnp-flash: add check for determining enabled flashLED module

Add check to determine enabled module, when module disablement sequence
is called. This check is necessary in order to avoid module disablement
when anyone of the flash/torch LED is in use.

Change-Id: I5d041ea531a78ce60ef0a793489602e3317f981a
Signed-off-by: Jigarkumar Kishorkumar Zala <j_zala@codeaurora.org>
Signed-off-by: Abinaya P <abinayap@codeaurora.org>