hw/nvram/fw_cfg: Remove legacy FW_CFG_ORDER_OVERRIDE

hw/nvram/fw_cfg: Remove legacy FW_CFG_ORDER_OVERRIDE

The MachineClass::legacy_fw_cfg_order boolean was only used
by the pc-q35-2.5 and pc-i440fx-2.5 machines, which got
removed. Remove it along with:

- FW_CFG_ORDER_OVERRIDE_* definitions
- fw_cfg_set_order_override()
- fw_cfg_reset_order_override()
- fw_cfg_order[]
- rom_set_order_override()
- rom_reset_order_override()

Simplify CLI and pc_vga_init() / pc_nic_init().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20250512083948.39294-12-philmd@linaro.org>
[thuth: Fix error from check_patch.pl wrt to an empty "for" loop]
Signed-off-by: Thomas Huth <thuth@redhat.com>