[PATCH] bcm43xx: Set floor of wireless signal and noise at -110 dBm

This patch sets the floor of wireless level (signal) and noise at
-110 dBm, which makes them be comatible with RCPI, as discussed by
Simon Barber. With this change, bcm43xx-softmac and bcm43xx-d80211
behave the same.

Signed-Off-By: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>