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

clk: rockchip: rk3128: modify rk3128 clk driver to 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.

Change-Id: If9571da0a86067d814c225629a6b6f07f0270f14
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>