usb: host: omap: add tput constrain on probe path

The patch 9f1d7a334 "usb: host: omap: add tput constrain on bus_resume"
added tput constraint on bus_resume, but the EHCI is active after
probe. So until first suspend-resume iteration the constraint was not set

This patch sets tput constraint on probe path

Change-Id: Id30dc6ae5ac831c0ef284710b917f83ef35add05
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>