clk: qcom: Update the frequency level for mdss_mdp_clk for smd670

286.67MHz frequency level of disp_cc_mdss_mdp_clk clock requires
to be changed to 286.666667MHz on sdm670, so update the same.

Change-Id: I0692bf5e14612c4f95667e8c1357971d885ee367
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>