clk: qcom: dispcc-blair: Allow config of cdivs for byte clk

Change the clk_regmap_div_ro ops to clk_regmap_div ops to
allow dynamic configuration of the cdivs. This is required
for cphy configuration where the byte intf clock need to be
the same frequency as its byte clock.

Change-Id: Iddf733697b7287577f690bd5535a60f406b7129a
Signed-off-by: BIVASH KUMAR SINGH <bkumarsi@codeaurora.org>