Merge tag 'pull-ppc-for-10.0-3-20250408' of https://gitlab.com/npiggin/qemu into...

Merge tag 'pull-ppc-for-10.0-3-20250408' of https://gitlab.com/npiggin/qemu into staging

* Fix a couple of recent regressions in powernv SPRs

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* tag 'pull-ppc-for-10.0-3-20250408' of https://gitlab.com/npiggin/qemu:
  target/ppc: Fix SPRC/SPRD SPRs for P9/10
  target/ppc: Big-core scratch register fix

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>