drm/amdgpu: use memcpy_toio for VCE firmware upload
Try to be clean here, even when it's a noop on x86. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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