[Toybox] [toybox] smack support

[Joya Cruz, Alejandro]

Hi Rob,

Doing some test between TOYBOX 0.6.0 and Smack I got interested on what
is the support that is given to Smack.
The most important user related utilitie it might are:
ls -Z Show the Smack labels on files. (already on toybox)

any idea when the rest is coming ( if its coming ) ? 
chsmack:Show and sett all of the Smack attributes on files.
cp --preserve=xattr: Create a new file with same content and Smack
attributes as an existing file.
id and id -Z to show the current process Smack label.
ps -Z show information about processes, including their Smack labels.