usb: chipidea: remove duplicate dev_set_drvdata for host_start

The core driver has already done it, besides, move set driver data
operation just after ci has allocated successfully in case some
code (like ci_role_start) want to access this driver data.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>