Many rockchip based arm64 boards use RK808 as PMIC, so
enabe it here let the board bootup normally.
Signed-off-by: NAndy Yan <andy.yan@rock-chips.com>
[added rk808-rtc as module and rk808-clk output built in]
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>