usb: phy: hsusb: Fix usb suspend/resume for mdm9635

When PLLBTUNE is used, upon usb resume the FSEL (clock reference selection)
should be zero, same as on msm_hsphy_init().

Change-Id: I8ff9c999a43c20d60211292d6bae2e0ddbe64c71
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>