usb: msm_otg: Add support for PMIC ID interrupt using devicetree

Allow platforms to pass PMIC ID interrupt number using device-tree.
This interrupt can be used to detect USB host cable connection
using PMIC and allows saving extra power by shutting down PHY.

Change-Id: I4f0a6802f6a6e1ed786d29a82da1a64cad1b5a73
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>