Removed loading duplicate instances of SDMA FW for Sienna_Cichlid,
As sienna_cichlid only use a single image for all instances.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>