usb: dwc2: Rename bit set/clear function names

Renamed __orr32 and __bic32 function names to more descriptive
dwc2_set_bit and dwc2_clear_bit respectively.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>