ehci: fix ehci pin mux init

EHCI pin mux init fucntion is still using old #ifdef
which are not defined anymore.This causes pin mux init to
always set TLL settings and thus EHCI PHY mode doesn't work.

Fixing this issue by using phy_mode parameter to initialize
mux settings.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>