Description: powercap: restrict energy meter to root access
References:
 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00389.html
Notes:
 carnil> Fixed in 5.9.8 for v5.9.y.
Bugs:
upstream: released (5.10-rc4) [949dd0104c496fa7c14991a23c03c62e44637e71]
4.19-upstream-stable: released (4.19.157) [900281e167f45e0c0e5df6e59fa00334b5e38133]
4.9-upstream-stable: released (4.9.243) [04533793ac10b38103d3aefe1c4b5b1eaf009f35]
sid: released (5.9.9-1)
4.19-buster-security: released (4.19.160-1)
4.9-stretch-security: released (4.9.246-1)