drm/amdgpu: use memcpy_to/fromio for UVD fw upload
Also use the firmware size from the header instead of calculating it. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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