vcn: get the IB size for vcn_dec ring
This is needed for GUI use case for vcn_dec ring, i.e. for VCN1/2/3 which does not use unified ring.
Signed-off-by: David (Ming Qiang) Wu David.Wu3@amd.com
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This is needed for GUI use case for vcn_dec ring, i.e. for VCN1/2/3 which does not use unified ring.
Signed-off-by: David (Ming Qiang) Wu David.Wu3@amd.com