Remove `dmidecode` from cpu-template-helper and devctr

[zulinx86]

Derived from discussion here: #3654 (comment)
As /sys/devices/virtual/dmi/id/bios_release is only available since kernel 5.8, it uses dmidecode command instead.
After the end of kernel 4.14 support, we need to drop the dependency of dmidecode command.

[roypat]

This was done in #4784