hw/gpio/aspeed_gpio: 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_gpio_info as abstract
base, aspeed_2400_gpio_info, aspeed_2500_gpio_info,
aspeed_2600_1_8v_gpio_info, aspeed_2600_3_3v_gpio_info,
aspeed_1030_gpio_info, aspeed_2700_gpio_info)
directly into the 'aspeed_gpio_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/20260601024959.2347639-13-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>