dwc3-msm: Add USB role switch handling

This change adds USB role switch framework based USB role
switch device which allows USB connector device driver to
notify about USB device/host mode to start required USB
stack.

Change-Id: Icfd1aabea939765944a1c3a95f31d7b3a47f1338
Signed-off-by: Mayank Rana <mrana@codeaurora.org>