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-4.9 'commit 83ae8fd54683
("cfg80211: revert the support for DH IE update")'.

This change also fixes the compilation errors and adds correct
compatible name.

Change-Id: If9e002fd862aa2dd97a2cf5ce165e82c80f7d21b
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>