drm/amdgpu: Add DID for aldebaran

Add 0x7408,0x740C,0x740F in pciidlist.

Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>