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[Why] Some features, such as HBlank expansion/reduction, needs to know how much HBlank is required to support basic audio. [How] Add interface to link to calculate required HBlank size for a given link + timing combination to support basic audio (i.e. 2-channel 48KHz). Reviewed-by: Wenjing Liu <wenjing.liu@amd.com> Signed-off-by: George Shen <george.shen@amd.com> Signed-off-by: Roman Li <roman.li@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>