drm/amd/amdgpu: Add missing BASE_IDX to dcn register
The register mmOTG1_OTG_BLANK_CONTROL was missing BASE_IDX value.
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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