ARM: dts: msm: add qpnp pinctrl, pwm and rtc devices for pmxpoorwills

Add qpnp pinctrl devices for the GPIOs in pmxpoorwills chip. This
allows consumers to manage the GPIOs using pinctrl configurations.

Add pwm device to support Pulse Width Modulation output and
rtc device node to support real-time clock.

CRs-Fixed: 2121650
Change-Id: I5b284204b13e3112685e2f9fa5d9036e2aad396a
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>