usb: otg: Retry putting the OTG PHY in low power mode.

The MSM OTG PHY does not go into low power mode when powered up with a
charger. Hence reset the PHY and add logic to retry the LPM Handshake.
This will avoid the msm_otg wakelock getting stuck forever when powered
up with a charger.

Signed-off-by: Ravikumar Vembu <a18394@motorola.com>
Signed-off-by: Luis Cruz <ljc2491@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>