leds: leds-qpnp: Correctly terminate of_device_id array

Correctly terminate of_device_id array to avoid of_device_lookup()
incorrectly probe an additional instance of leds-qpnp device.

Change-Id: Ie6c61b4500a5fbe792e3154a761c235573c7e6bf
CRs-Fixed: 582141
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>
leds: leds-qpnp: Set the strobe bit correctly for flash led

The strobe bit is set to 1 when the flash led uses HW strobe and it is
set to 0 when the flash led uses SW strobe.

CRs-Fixed: 585414
Change-Id: Id65e9e70bc6c84ca5c8a9e65fd86e67b513e6745
Signed-off-by: Abinaya P <abinayap@codeaurora.org>