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

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

* target/i386: miscellaneous changes, mostly TCG-related
* fix --without-default-devices build
* fix --without-default-devices qtests on s390x and arm

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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (27 commits)
  configs: disable emulators that require it if libfdt is not found
  hw/xtensa: require libfdt
  kconfig: express dependency of individual boards on libfdt
  kconfig: allow compiling out QEMU device tree code per target
  meson: move libfdt together with other dependencies
  meson: pick libfdt from common_ss when building target-specific files
  tests/qtest: arm: fix operation in a build without any boards or devices
  i386: select correct components for no-board build
  hw/i386: move rtc-reset-reinjection command out of hw/rtc
  hw/i386: split x86.c in multiple parts
  i386: pc: remove unnecessary MachineClass overrides
  i386: correctly select code in hw/i386 that depends on other components
  xen: register legacy backends via xen_backend_init
  xen: initialize legacy backends from xen_bus_init()
  tests/qtest: s390x: fix operation in a build without any boards or devices
  s390x: select correct components for no-board build
  s390: move css_migration_enabled from machine to css.c
  s390_flic: add migration-enabled property
  s390x: move s390_cpu_addr2state to target/s390x/sigp.c
  sh4: select correct components for no-board build
  ...

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