msm: flash: Use low-power flash when battery is low

When battery is at 35% or lower and high-power flash is requested, use
low-power flash instead. This fixes the hard shutdowns that occur when
taking pictures with flash on low battery.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	arch/arm/mach-msm/htc/htc_battery_8x60.c

Change-Id: I8219dca864e7cae5f0ec1f530fdeb46019ceda9b