staging: dwc2: rename dwc2_hcd_intr() to dwc2_handle_hcd_intr()

This makes the function name more clear and consistent with
dwc2_handle_common_intr().

Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>