0d69f00b4d
Summary: To safely synchronize timebase we need to disable the timebase on all cores, set timebase, and resynchronize. This adds two new devices, mutually exclusive, which attach on the SoC simplebus, to freeze and unfreeze the timebase. The devices are singletons, and platform-specific, so no reason to make them optional and in separate files. This was found to be necessary for top(1) to work correctly on an AmigaOne X5000 (P5020 SoC). It also fixes bufdaemon and bufspacedaemon hangs at shutdown. Test Plan: Regression test on various Book-E hardware. Reviewed by: nwhitehorn Tested by: Brandon Bergren (git_bdragon.rtk0.net) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D19208
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