USB: OTG: msm: Depend completely on PMIC for VBUS and ID notifications

USB ID and VBUS lines are routed to PMIC on 8960 for supporting
aggressive power management features like system VDDCX minimization
and turning off PHY voltage regulators. Hence OTG control is set
to PMIC control on 8960.

The current design uses PMIC notifications only for waking up from
low power mode and wait for the interrupt from USB hardware.  The
session valid threshold values are different between PHY and PMIC.
This might result an inconsistent state during fast plug in and
plug out of a wall charger.  Hence completely depend on PMIC for
VBUS and ID detection.  PHY ACA block is still used for detecting
ACA states.

Change-Id: Ia6dbe60b4b8d5a9cdbb7d45817f8e546c3683e97
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>