rockchip: Migrate to use USB_DWC3_GENERIC on RK3328

rockchip: Migrate to use USB_DWC3_GENERIC on RK3328

After the full convertion of usb gadget interrupt handling to
usb_gadget_generic_ops, it is now possible to use DM_USB_GADGET,
DWC2_OTG and DWC3_GENERIC together without causing a build error.

Change to use USB_DWC3_GENERIC instead of USB_XHCI_DWC3 to complte the
migration initiated in commit 1bc4e8eb1d7f ("rockchip: Migrate to use
DM_USB_GADGET on RK3328"). No functional change is intended.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>