They are small programs on which the that the coreboot utility script depends on to be able to do it’s job. The script does all the work, you do not need to mannually use dmidecode and the others you mentioned.
Regarding this, you can run the following command from a terminal:
sudo apt install dmidecode wget coreutils gzip git build-essential libpci-dev libudev-dev zlib1g-dev gnat m4 bison flex libncurses5-dev
It will install the missing dependencies