phy: msm: usb: Add support to handle floating D+/D- lines

There is a possibility of PMI detecting SDP as a floating charger
when connected to a PC. Workaround this issue by starting
peripheral stack for floating charger as well. After 10 sec check
for USB device enumeration using gadget USB state. If device is
indeed connected to SDP gadget usb state will be
USB_STATE_DEFAULT or higher.

Change-Id: I9b8f9ee0611277b2ff86a4855da783d47820cf2a
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>