Revert "usb: dwc2: add bus suspend/resume for dwc2"

This reverts commit 0cf884e8.
Even after applying the follow-on patch at
https://patchwork.kernel.org/patch/5325111


there are still problems with device connect on the Altera SOCFPGA
platform at least. One possible fix would be to add a whitelist
to enable suspend/resume on platforms where it does work correctly.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>