usb: phy: msm-hsusb: Allow VDD MIN when DCP charger is connected

VDD and the analog rails are currently not getting turned off if a
charger is connected. This will cause additional power consumption
which can be an issue if the battery is fully charged and no longer
charging. Allow only VDD MIN, but not PHY retention in
msm_hsphy_set_suspend() when a charger is connected.

CRs-fixed: 752229
Change-Id: If27d8d7fd044a821d955cdeb3b3d004a786cfdee
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>