usb: phy: qusb: Make sure QUSB PHY is into proper state

On some platforms, QUSB PHY's DVDD related power supply (LDO) is
not always ON. Hence when this power supply is switched off, QUSB
PHY's register configuration is not retained. QUSB PHY state is
unknown when required LDOs are turned ON with USB cable connect
case and may interfere charger detection. Hence use suggested sequence
which involves resetting QUSB PHY and performing few set of QUSB PHY
register configuration to bring QUSB PHY into non-driving mode.

CRs-Fixed: 1046610
Change-Id: Ifc910fcd7df66575be0e0d9d3fc1850bc8831b05
Signed-off-by: Mayank Rana <mrana@codeaurora.org>