cam iosched: Add a handler for the quanta sysctl to enforce valid values
Invalid values can result in devision-by-zero panics or other
undefined behaviour so lets not allow them.
PR: 221957
Obtained from: ElectroBSD
Submitted by: Fabian Keil
Differential Revision: https://reviews.freebsd.org/D12351
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head/sys/cam/cam_iosched.c