usb: phy: implement init sequence for ssusb qmp phy

Configure the QMP PHY registers and set the required clocks
rate as required by the PHY initialization sequence.

Change-Id: Ib1ca2bceefd8a044239a989723b1ca6b0b05da2a
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>
Signed-off-by: Bar Weiner <bweiner@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>