leds: Queue screen brightness on the suspend workqueue. Queueing screen brightness change on suspend workqueue ensures that userspace initiated changes to screen brightness (especially when the END key is pressed) so not get triggered while early suspend is in progress

CRs fixed: 265531

Change-Id: Ia831730dd175ba44966691c2c9949cf5f01f0f55
Signed-off-by: Anurag Singh <anursing@codeaurora.org>
(cherry picked from commit 0df10f1)

Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>
Signed-off-by: garwedgess <garethwilliams21@gmail.com>