usb: phy: Add snapshot of PHY msm usb driver

This change adds PHY msm usb driver which handles PHY initialization,
clock management,and workarounds required after resetting the
hardware and power management.

This snapshot is taken as of msm-4.14 'commit 86918472c0fd
("ARM: dts: msm: support A/B OTA for LW.2.0")'.
This change also fixes the compilation errors.

Change-Id: I5f262a097a87393b5eeffa3f3ae3e21088ef53f1
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>