tools: add mount to Debian tools tree

Author: behrmann

mkosi/resources/mkosi-tools/mkosi.conf.d/debian-kali-ubuntu/mkosi.conf

@@ -16,6 +16,7 @@ Packages=
         libfido2-1
         libseccomp2
         libtss2-dev
+        mount
         policycoreutils
         python3
         python3-pefile