usb: dwc3: gsi: Disable GSI wrapper on clearing run_stop

Disable GSI wrapper on clearing run_stop to prevent
unnecessary access by GSI wrapper because of the
pending GEVNTCOUNT on the GSI interrupters.

Change-Id: I8ee7fe25d33713487b74044a3a02deff0b7057aa
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>