Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* SCSI unit attention fix
* add PCIe devices to s390x emulator
* IDE unplug fix for Xen

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# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
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# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [undefined]
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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  scsi: clear unit attention only for REPORT LUNS commands
  scsi: cleanup scsi_clear_unit_attention()
  scsi: fetch unit attention when creating the request
  kconfig: Add PCIe devices to s390x machines
  hw/ide/piix: properly initialize the BMIBA register

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>