Merge tag 'pull-ppc-for-9.0-3-20240331' of https://gitlab.com/npiggin/qemu into staging

Merge tag 'pull-ppc-for-9.0-3-20240331' of https://gitlab.com/npiggin/qemu into staging

Various fixes for recent regressions and new code.

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* tag 'pull-ppc-for-9.0-3-20240331' of https://gitlab.com/npiggin/qemu:
  tests/avocado: ppc_hv_tests.py set alpine time before setup-alpine
  tests/avocado: Fix ppc_hv_tests.py xorriso dependency guard
  target/ppc: Do not clear MSR[ME] on MCE interrupts to supervisor
  target/ppc: Fix GDB register indexing on secondary CPUs
  target/ppc: Restore [H]DEXCR to 64-bits
  target/ppc/mmu-radix64: Use correct string format in walk_tree()
  hw/ppc/spapr: Include missing 'sysemu/tcg.h' header
  spapr: nested: use bitwise NOT operator for flags check

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>