configs: Drop unused XHCI_DWC3 for RK3328 boards

Driver support for rk3328 is not supported so drop this
unused XHCI_DWC3.

Cc: Tianling Shen <cnsztl@gmail.com>
Cc: David Bauer <mail@david-bauer.net>
Cc: Loic Devulder <ldevulder@suse.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Banglang Huang <banglang.huang@foxmail.com>
Cc: Matwey V. Kornilov <matwey.kornilov@gmail.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>