qat: restrict sysctl access to privileged users
Access to crucial QAT driver internals, such as
firmware counters and transport debug via
sysctl, has been limited to privileged users only.
Reviewed by: markj, ziaee
MFC after: 2 weeks
Sponsored by: Intel Corporation
Differential Revision: https://reviews.freebsd.org/D50379
(cherry picked from commit 8aa51e6d7de0a828020de64560d1385e15955a1c)