usb: phy-msm-snps: Implement msm_hsphy_set_suspend API

API gets called upon host and device bus suspend/resume and
usb cable connect/disconnect. Currently ref clk remains on upon
bus suspend and LDOs remain on upon cable disconnect. This
prevents XOSD and VDD min. Turn off ref clk upon bus suspend
and turn off LDOs and ref clk upon cable disconnect.

Change-Id: Ic14abf494105c296a4f4a66d9475c45cc3eae2c4
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>