ARM: dts: msm: Add pinctrl device nodes for HiFi amplifier on MSM8998

HiFi amplifier uses lineout path in the codec to be routed to
headphone amplifiers. This routing needs two gpios to be
toggled. Add pinctrl device nodes to control gpios for
HiFi amplifier usecase.

Change-Id: I8d34eecd562ab50a8ec89f241406092d1b763a9a
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>