USB: dwc3: msm: Fix stop endpoint command timeout issue

Currently HSPHY SUSP bit is set while starting host mode and
it is not cleared till stopping host mode. As part of urb dequeue,
xhci stack will queue stop endpoint command for flushing endpoint
which is getting timedout due to this HSPHY SUSP bit. Hence clear
this bit before queuing stop endpoint command and set it back after
stop endpoint command completion. Otherwise xhci stack treats this
timeout as fatal error and halts host controller.

Crs-Fixed: 580268
Change-Id: I784407386e6f87bcabd8569fcbae4e3af167144d
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>