hostnamed: introduce new "embedded" chassis type

We really don't want to get lost in adding fridge, car, plane, drone, or
whatever else, hence add a generic term "embedded" cover all the cases
where the computer is just part of something bigger, and not at the
focus of things.

shell-completion/bash/hostnamectl

@@ -52,7 +52,7 @@ _hostnamectl() {
         if [[ -z $verb ]]; then
                 comps=${VERBS[*]}
         elif __contains_word "$verb" ${VERBS[CHASSIS]}; then
-                comps='desktop laptop server tablet handset watch vm container'
+                comps='desktop laptop server tablet handset watch embedded vm container'
         elif __contains_word "$verb" ${VERBS[STANDALONE]} ${VERBS[ICONS]} ${VERBS[NAME]}; then
                 comps=''
         fi