wusbhc: disable suspend and resume on the root hub.

Suspend and resume are not currently supported on the wireless root hub.
Remove the suspend and resume op functions in the host controller driver
to avoid constant error messages in the system log.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>