leds: pm8xxx: Add PWM feature in leds-pm8xxx

Pass PWM period and other configuration from board file.
Update the LPG LUT based on the duty cycles,
pause count, and period.

Change-Id: Ie1812ae8010d986a943af6f3883b13c25bc7244c
Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>
3 files changed