clk: qcom: dispcc-kona: Allow config of cdivs for byte0/1 clks

Change the clk_regmap_div_ro ops to clk_regmap_div ops to allow
dynamic configuration of the cdivs, this is required for certain
panels where the intf clocks need to be the same frequency as
its byte counter part.

Change-Id: Ia623fc4b39f3b31fc8a299075194c7094fd4c653
Signed-off-by: David Dai <daidavid1@codeaurora.org>