hw/misc/aspeed_scu: Convert to DEFINE_TYPES() with inlined TypeInfo

Replace the legacy type_register_static()/type_init() registration
pattern with the modern DEFINE_TYPES() macro.

Inline 7 standalone TypeInfo variables (aspeed_scu_info as abstract
base, aspeed_2400_scu_info, aspeed_2500_scu_info, aspeed_2600_scu_info,
aspeed_1030_scu_info, aspeed_2700_scu_info, aspeed_2700_scuio_info)
directly into the 'aspeed_scu_types[]' array, removing the need for
separate declarations.

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260601024959.2347639-7-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>