phy: qualcomm: Add Synopsys High-Speed USB PHY driver

It adds Synopsys 28nm Femto High-Speed USB PHY driver support, which
is usually paired with Synopsys DWC3 USB controllers on Qualcomm SoCs.

Changes for v2:
 - Roll back voltage settings in case function
   qcom_snps_hsphy_config_regulators() fails in the middle.
 - Add a comment for init-seq tuple which consists of 3 numbers.
 - Sort include headers alphabetically.
 - Sort register definitions in order of offset.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>