mips, nvme/pci boot regression (commit 145e2198d749)

[Klaus Jensen]

Hi Philippe,

Commit 145e2198d749 ("hw/mips/gt64xxx_pci: Endian-swap using
PCI_HOST_BRIDGE MemoryRegionOps") broke my mips64 nvme boot test
(little-endian host, mips64 and nvme boot device).

The pci device doesn't show up and the kernel panics.

  qemu-system-mips64 \
    -nodefaults -nographic -snapshot -no-reboot \
    -M "malta" -cpu "I6400" -m 512M \
    -nic user,model=pcnet \
    -drive file=images/rootfs.ext2,format=raw,if=none,id=d0 \
    -device nvme,serial=default,drive=d0 \
    -kernel images/vmlinux \
    -append "root=/dev/nvme0n1 console=ttyS0,115200" \
    -serial stdio

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