config: rk3399: add usb related configs

This patch to enable configs for usb module
- xhci
- ehci
- usb storage
- usb net

Signed-off-by: MengDongyang <daniel.meng@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Squashed in patch to move to Kconfig:
  https://patchwork.ozlabs.org/patch/672543/


Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>