Remove *.cmd and command_util.bash.

Remove *.cmd and command_util.bash.

The four *.cmd files are no longer needed and can be removed,
along with the script which transformed these files into C code. The
directory for the generated files, $(build_dir)/cmdlist, can go away
as well.

With command_util.bash gone, the Makefile can also be cleaned up
considerably. In particular, the ugly TOUPPER make function can be
removed because it was only used by the command_util recipe. Moreover,
The dependencies for the *.command_list.* files are no longer needed.

Finally, the sed command which fixed up the dependencies in the *.d
files can be simplified.