drm/amdgpu: Only support RAS EEPROM on dGPU platform

RAS EEPROM device is only supported on dGPU platform for smu v13_0_6.

Signed-off-by: Candice Li <candice.li@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>