drm/amdgpu: fix incorrect EP_STRAP reg offset for aldebaran

mmRCC_DEV0_EPF0_STRAP0 offset in aldebaran is changed
from arcturus

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>