Adding GPIO mux config used for PHY reset of EHCI port on base board.
We get below failure message without this patch,

"hub 1-0:1.0: unable to enumerate USB device on port 1"
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>