msm_fb: Add backlight support using both GPIO 96 and PWM

Add support for backlight control on EVB using both the
LCD_BACKLIGHT GPIO and also the PWM approach on 8x25 EVB.
Also increase the backlight levels supported on 7x27A
from 100 levels to 256 levels.

CRs-fixed: 365523
Change-Id: I4806644783cc98e01192a3101bc852487bb3b592
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
10 files changed