hw/ppc: Avoid shifting left into sign bit
Add U suffix to various places where we were doing "1 << 31", which is undefined behaviour, and also to other constant definitions in the same groups, for consistency. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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