The rtl8192e procfs-based debug interface seems very broken

The procfs debug code in rtl_debug.c is, ironically, very buggy: it lacks proper locking.
Since the most useful part of the code (the stats) are available through more
standard APIs, I think it is best to just delete the whole mess.

Signed-off-by: Sean MacLennan <seanm@seanm.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>