drm/msm/hdmi: Remove mmagic_iface_clk from the 8x96 PHY clocks

This was used as a placeholder. It was never really input to the MDSS/HDMI
clocks.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>