Log Message:
qemu: update to 6.2.0

Tested on NetBSD-current/amd64 w/nvmm and macOS/aarch64 w/hvf.

pkgsrc note: Recent upstream changes seem to have unintentionally broken the
NetBSD usermode emulation. User-mode emulation is thus disabled until someone
fixes this. Hint: see qemu/bsd-user/freebsd commits by M. Warner Losh.

Changes:

m68k
  Improved support for Apple's Nubus, including the ability to load
    declaration ROMs and slot IRQ support
  The macfb framebuffer device now supports the same video modes found
  on a real Quadra 800
Arm
  On macOS hosts with Apple Silicon CPUs we now support the 'hvf'
    accelerator for running AArch64 guests
  M-profile CPUs now emulate trapping on division by zero via CCR.DIV_0_TRP
  The pl011 UART model now supports sending 'break'
  The Fujitsu A64FX processor model is now supported in TCG ('-cpu a64fx')
  The M-profile MVE extension is now supported, and enabled in the Cortex-M55
  The deprecated machine names 'raspi2' and 'raspi3' have been removed;
    use 'raspi2b' and 'raspi3b' instead
  The 'virt' machine now supports an emulated ITS
  New machine type: kudo-bmc
  The xlnx-zcu102 and xlnx-versal-virt machines now support
    BBRAM and eFUSE devices
  The 'virt' machine now supports more than 123 CPUs in TCG emulation mode
  The pl031 real-time clock device now supports sending RTC_CHANGE QMP events
PowerPC
  Improved POWER10 support for the 'powernv' machine
  Initial support for POWER10 DD2.0 CPU added
  Added support for FORM2 PAPR NUMA descriptions in the "pseries" \ 
machine type
RISC-V
  Add Zb[abcs] instruction support
  Remove RVB support
  Fixup virt flash node
  Don't override users supplied ISA version
  Fixup some CSR accesses
  Fix an overflow in the SiFive CLINT
  ePMP CSR address updates
  SiFive PWM support
  Support for RISC-V ACLINT
  Support vhost-user and numa mem options on all boards
  mstatus.SD bug fix for hypervisor extensions
  OpenTitan fix for USB dev address
  OpenTitan update to latest bitstream build
  Remove the Ibex PLIC
  Bug fix of setting mstatus_hs.[SD|FS] bits
  Fixes for sifive PDMA
  Mark shakti_c as not user creatable
  Add support for the experimental J extension
  Update the fmin/fmax handling
s390x
  Improved storage key emulation
  New gen16 CPU features are now enabled automatically
SPARC
  Fix for booting sun4m machines with more than 1 CPU
x86
  New Snowridge-v4 CPU model, with split-lock-detect feature disabled
KVM
  Support for SGX in the virtual machine
  New "hv-apicv" CPU property (aliased to "hv-avic")
AMD SEV
  Measured launch with direct kernel boot is now possible
virtio
  QEMU now fully supports guest memory dumps with virtio-mem.
  QEMU now cleanly supports precopy/postcopy migration & background snapshots
9pfs
  Fixed an occasional crash when handling 'Twalk' requests
  Fixed sub-optimal I/O performance on guest
QMP
  New event DEVICE_UNPLUG_GUEST_ERROR
Block device backends and tools
  qemu-nbd now defaults to writeback caching
  qemu-nbd now has a --selinux-label option for Unix socket label
TCG
  plugins now have a bool arg parsing helper and cleaned up argument syntax
  the cache plugin is now multi-core aware