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Add sys/devices/system/cpu/{possible,present} to linsysfs(5).

Description

Add sys/devices/system/cpu/{possible,present} to linsysfs(5).
That makes Linux lscpu(1) work.

Reviewed by: dchagin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20131