configs: rockchip: Use dwc3-generic driver on RK3328 and RK3399

Complete the transition away from xhci-dwc3 and dwc3-of-simple drivers
and change to use the dwc3-generic driver on remaining RK3328 and RK3399
boards.

MISC, USB_DWC3 and USB_DWC3_GENERIC is enabled on boards that used to
enable USB_XHCI_DWC3. USB_XHCI_DWC3 is dropped from updated boards along
with the default y of USB_XHCI_DWC3_OF_SIMPLE.

There is no intended change in functionality with this changes, USB 3.0
is expected to continue same as before this change.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>