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bitset: add BIT_FFS_AT() for finding the first bit set greater than a start bit

Description

bitset: add BIT_FFS_AT() for finding the first bit set greater than a start bit

Reviewed by: kib
Approved by: scottl (implicit)
MFC after: 1 week
Sponsored by: Ampere Computing, Inc.
Differential Revision: https://reviews.freebsd.org/D26128