clk: qcom: mdss: Fix switched bit clk rate after suspend-resume

After suspend-resume, bit clk rate should be cooresponding to
the switched clk rate. Currently,it is switching back to original
60fps clk rate. To fix this, add CLK_GET_RATE_NOCACHE flag for
vco clk in DSI 14nm pll so that after suspend-resume, clk is
calculated based on cached vco rate corresponding to the
switched bit clk rate.

Change-Id: Ib0445fcbb596e15a5ca4b6edbce7062173f2debb
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>