ARM: dts: qcom: apq8064-ifc6410: drop hdmi-mux-supply

The HDMI circuitry on the IFC6410 is not powered by the 3v3. Drop the
hdmi-mux-supply property.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220609122350.3157529-5-dmitry.baryshkov@linaro.org