ppc patch queue for 2022-05-05: The star of the show in this PR is the 'Remove hidden usages of *env' work done by Víctor, which impacts a lot of target/ppc code and we want to get it landed ASAP so future target/ppc contributions can be based on it. Other changes: - XIVE fixes in guest interrupt handling - BookE debug interrupt fix - vhost-user TARGET_PPC64 macro fix - valgrind fixes in kvmppc functions