clk: qcom: mdss: set the hdmi vco clock rate

Set the VCO rate properly during handoff. This VCO rate can be
used during suspend-resume to reconfigure the PLL.

Change-Id: Ib67d68f28aa5bd3a09bf7bcc5802ee3b7af342ee
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>