i965: Remove duplicate copies of mlen & rlen from instruction decode.

i965: Remove duplicate copies of mlen & rlen from instruction decode.

After printing the details of a specific message, we always print out
the message length and response length with nice "mlen" and "rlen"
labels.

For Gen5+ URB writes, we were dumping mlen and rlen a second time:
urb 0 urb_write interleave used complete mlen 5, rlen 0 mlen 5 rlen 0

Also, for Gen6 data port messages, we were including mlen and rlen in
the tuple of undecipherable integers.

Both of these are completely redundant.  So, remove them.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>