drm/amdgpu/sriov: Correct the setting about sdma doorbell offset of Vega10

Correct the format

For vega10 sriov, the sdma doorbell must be fixed as follow to keep the
same setting with host driver, or it will happen conflicts.

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>