ARM: dts: msm: Update PWM and coin cell device configurations for pm8916

Add coin cell device node and update the PWM node to be in compatible 
with the "pwm-qti-lpg" driver for qm215. Also enable the charger,
bms and vibrator nodes for qm215-qrd platform.

Change-Id: I01f3905ceeb8eeadc74ec7211061a65771725f75
Signed-off-by: Kavya Nunna <knunna@codeaurora.org>