clk: rockchip: add restart handler

Add infrastructure to write the correct value to the restart register and
register the restart notifier for both rk3188 (including rk3066) and rk3288.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --cc drivers/clk/rockchip/clk-rk3188.c
Simple merge

diff --cc drivers/clk/rockchip/clk-rk3288.c
Simple merge

diff --cc drivers/clk/rockchip/clk.c
Simple merge

diff --cc drivers/clk/rockchip/clk.h
Simple merge