lkdtm: prefix enum constants

Prefix cname and ctype constants with CN/CT_.  This is especially for the
conflict on BUG which causes a build break if arch defines it as a inline
function, i.e.  MIPS.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Ankita Garg <ankita@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>