In order to work LDVS, DSI in mainline tree for Rockchip based
hardware platforms, the associated PHY driver has to enable
in default defconfig.

Enable rockchip DSI phy driver.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20201109181017.206834-9-jagan@amarulasolutions.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>