Revert "memory: Drop FlatRange.romd_mode"
This reverts commit 5b5660ad, as it breaks the UEFI guest firmware (known as ArmVirtPkg or AAVMF) running in the "virt" machine type of "qemu-system-aarch64": Contrary to the commit message, (a->mr == b->mr) does *not* imply that (a->romd_mode == b->romd_mode): the pflash device model calls memory_region_rom_device_set_romd() -- for switching between the above modes --, and that function changes mr->romd_mode but the current AddressSpaceDispatch's FlatRange keeps the old value. Therefore region_del/region_add are not called on the KVM MemoryListener. Reported-by: NDrew Jones <drjones@redhat.com> Tested-by: NDrew Jones <drjones@redhat.com> Analyzed-by: NLaszlo Ersek <lersek@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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