drm/amd/display: runtime select dmub emulatior.
[Why & How] Add emul specific hw function to dmub, in case of emulator is created, we can runtime switch between dmub emulator or dmub uC via is_virtual flag in dmub. Signed-off-by: NYongqiang Sun <yongqiang.sun@amd.com> Reviewed-by: NTony Cheng <Tony.Cheng@amd.com> Acked-by: NQingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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