ARM: dts: msm: Add USB device nodes for msm8937

Add required USB device node for msm8937 for USB functionality
to be working.

Change-Id: If10c87cb83d9a5d171503472f90f06b83b8e4000
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>