drm/radeon/dp: add back special handling for NUTMEG
When I fixed the dp rate selection in: 092c96a8 drm/radeon: fix dp link rate selection (v2) I accidently dropped the special handling for NUTMEG DP bridge chips. They require a fixed link rate. Reviewed-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NKen Wang <Qingqing.Wang@amd.com> Reviewed-by: NHarry Wentland <harry.wentland@amd.com> Tested-by: NKen Moffat <zarniwhoop@ntlworld.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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