ARM: dts: msm: Add USB HSPHY and SSPHY device nodes

Add device nodes for USB HSPHY and SSPHY in order to logically
separate them from the controller. Add their phandles to the
USB controller node to allow the driver to look them up.

Change-Id: I07c0c37b15fb5d96b738325ff220e649d1cdc831
Signed-off-by: Jack Pham <jackp@codeaurora.org>