Merge tag 'pull-la-20220814' of https://gitlab.com/rth7680/qemu into staging

Merge tag 'pull-la-20220814' of https://gitlab.com/rth7680/qemu into staging

Loongarch docs update

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* tag 'pull-la-20220814' of https://gitlab.com/rth7680/qemu:
  docs/system/loongarch: Update the LoongArch document

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