b43-tools: b43-fwsquash.py: manually remove LP-PHY 16 support

I have never seen a LP-PHY with core rev 16 or higher, but the ucode
will be included, because we need LP-PHY 13 and 15 and N-PHY core rev
16. Comment out the code for now.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 41595