usb: dwc2: Update registers definitions to support service interval

Added GHWCFG4_SERVICE_INTERVAL_SUPPORTED and
DCTL_SERVICE_INTERVAL_SUPPORTED bits definitions to support
service interval based scheduling.

Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>