Disable all watchdogs and blacklist their kernel modules

Nate Grahamrequested to merge
work/ngraham/no-watchdogs-ever into master

We don't need a watchdog for normal desktop use cases. Expressing that intention, we had already set kernel.nmi_watchdog = 0 to disable the kernel panic watchdog.

We can go further and instead use the "nowatchdog" kernel parameter to disable all of them, and then additionally blacklist their kernel modules. This should have a very slightly positive impact on battery life and boot/shutdown times.

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