drm/amd/display: WA for 3 display play video hot plug.
Three monitor connected and playing a video will occupy all 4 pipes, if hot plug forth display, commit streams will be failed due to no free pipe can be found. Work around: When forth monitor connected, mark video plane as a fake plane, remove it in dc, keep it in dm and report address to OS, until OS turn off MPO. Signed-off-by: NYongqiang Sun <yongqiang.sun@amd.com> Reviewed-by: NTony Cheng <Tony.Cheng@amd.com> Acked-by: NHarry Wentland <Harry.Wentland@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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