[Bug 259036] Add PPS_SYNC to GENERIC kernel configuration

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259036

--- Comment #7 from Ian Lepore <ian@FreeBSD.org> ---
I don't know of any downside to having OPTION PPS in the kernel and not using
the feature other than a bit of wasted code space (which probably doesn't add
up to more than 1-2kbytes).

I don't understand the comment about PPS not being useful on ppc or riscv.  You
can feed a PPS pulse to a system on any gpio pin or serial port, including
usb-serial adapters.  If you use ftdi adapters you can get accuracies in the +-
50us range, cheaper brands still get you millisecond accuracy which is as good
as a network connection).

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