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

[zulinx86]

Derived from discussion here: https://github.com/firecracker-microvm/firecracker/pull/3654#discussion_r1184696354 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.