clk: rockchip: modify rk3128 clk driver to also support rk3126

rk3128 and rk3126 have some gate registers describe differences.
So need to make some distinctions.
The RK3126 and RK3128 Same clock description we move it to
the common clock branches.
And the different clks description use the own clock branches.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>