phy-msm-qusb-v2: Perform PHY reset after cable connect

Phy is reset during disconnect to make sure dp/dm are in high-z state
for next cable connect. If analog ldos are shared across peripherals,
turning on/off analog ldo w/o turning on digital ldo can result into
undefined behavior. Reset the phy after charger notifies cable connect
using dpdm floating regulator to reset the internal state so that
dp/dm lines are high-z when usb cable is connected.

Change-Id: I5cae00c1853693d7bd6d85de2a238a4aababe06e
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>