usb: msm-ssphy: Add support for clock-based reset

Newer targets require the SS PHY to be reset using GCC,
which is provided by the msm clock framework. This replaces
the functionality of the SS_PHY_RESET bit of the SS_PHY_CTRL
register. Perform the clock-based reset during initialization
as well as coming out of power collapse.

CRs-fixed: 499388
Change-Id: I23ae307da3f5c75cad7db466a514fde78ee43e21
Signed-off-by: Jack Pham <jackp@codeaurora.org>