clk: qcom: Add support for 286.67MHz for mdp clocks for SDM670

Display mdp clocks on SDM670 require to support 286.67Mhz,
so add support for the same.

Change-Id: Ie096d09d0606084058c7f640a14432f62fc73485
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>