dwc3-msm: Add dwc3_msm_release_ss_lane() API

DP driver needs to use both USB SS lane in some use case. Hence
to release USB SS lane, add dwc3_msm_release_ss_lane() API which
performs below operations:
i. Stop USB host mode
ii. Start USB host mode into high speed mode if USB host mode
was active.

dwc3_msm_release_ss_lane() API is blocking call, and will comeback
once above both operations are performed.

Change-Id: I56df606914a613bfe4b76298b0041a66fc74878d
Signed-off-by: Mayank Rana <mrana@codeaurora.org>