soc: qcom: pil: Update pil to use the new smp2p interface

Smp2p is no longer using the gpio controller interface any more.
So remove all the gpio related api and use irq interface directly.

Change-Id: I44a584e179d812238b4631b646fff8577cf1d5f9
Signed-off-by: Runmin Wang <runminw@codeaurora.org>