usb: chipidea: usb2: absorb zevio glue driver

ZEVIO glue code is is identical to generic binding now, but doesn't
enable runtime PM. Let's squash the driver and get runtime PM for free.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Peter Chen <peter.chen@nxp.com>