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[Why] Equalisation is the mandatory second phase of DisplayPort link training over a USB4 DP tunnel. [How] Implement equalisation phase for DP tunneled over USB4 in DPIA training module. Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Wayne Lin <Wayne.Lin@amd.com> Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>