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

* target/i386: improved EPYC models
* more removal of mb_read/mb_set
* bump _WIN32_WINNT to the Windows 8 API
* fix for modular builds with --disable-system

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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  meson: leave unnecessary modules out of the build
  docs: clarify --without-default-devices
  target/i386: Add EPYC-Genoa model to support Zen 4 processor series
  target/i386: Add VNMI and automatic IBRS feature bits
  target/i386: Add missing feature bits in EPYC-Milan model
  target/i386: Add feature bits for CPUID_Fn80000021_EAX
  target/i386: Add a couple of feature bits in 8000_0008_EBX
  target/i386: Add new EPYC CPU versions with updated cache_info
  target/i386: allow versioned CPUs to specify new cache_info
  include/qemu/osdep.h: Bump _WIN32_WINNT to the Windows 8 API
  MAINTAINERS: add stanza for Kconfig files
  tb-maint: do not use mb_read/mb_set
  call_rcu: stop using mb_set/mb_read
  test-aio-multithread: simplify test_multi_co_schedule
  test-aio-multithread: do not use mb_read/mb_set for simple flags
  rcu: remove qatomic_mb_set, expand comments

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