drm/amdgpu: support indirect access reg outside of mmio bar (v2)
support both direct and indirect accessor in unified helper functions. v2: Retire indirect mmio access via mm_index/data Signed-off-by: NHawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Reviewed-by: NKevin Wang <kevin1.wang@amd.com> Reviewed-by: NGuchun Chen <guchun.chen@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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