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Unify hdp related function into hdp structure for hdp version 4.
V2: Add function to remap hdp registers for nbio version 6.1
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>