usb: phy: qusb: Keep LDOs ON during disconnect if PMI voted for it

PMI software requests PHY driver to turn-ON LDOs before running
charger detection. This is needed to have USB data lines in hi-Z
state. If there is race between USB driver processing disconnect
and next rm_pulldown request, then there is a possibility of
PHY driver turning-off LDOs even if PMI voted for it. This can
cause charger detection to fail. To fix this add a check in PHY
driver to check PMI vote in disconnect handling.

Change-Id: I6e873207aeee60e8e933430fc4e755aef81ab447
CRs-fixed: 1097343
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>