clk: rockchip: Add support for hclk_sfc on rk3036

Add support for the bus clock for the serial flash controller on the
rk3036. Taken from the Rockchip BSP kernel but not tested on real
hardware (as I lack a 3036 based SoC to test).

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20210713094718.1709-2-jon.lin@rock-chips.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>