dwc3-msm: Add functionality to restart USB host mode

This change adds functionality to restart USB host mode in high speed
only mode if USB host mode is used with super speed mode to release
USB SS lanes for 4 lane DP functionality.

Change-Id: Id0c3a91e2a8db9d7088a9b0b611e8ce3a4e159d9
Signed-off-by: Mayank Rana <mrana@codeaurora.org>