drm/amd/display: [FW Promotion] Release 0.0.91

Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>