rockchip: rk3588-rock-5a: Enable support for USB 2.0 ports

Enable Kconfig options for the two USB 2.0 ports and bottom USB 3.0 port
on ROCK 5 Model A.

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