staging: brcm80211: fix for reported log spam problem

Every few minutes, this message would appear in syslog:

ieee80211 ph0: wl_ops_bss_info_changed: BSS idle: true (implement)

The message has been deleted, the driver requires no special action on this
particular event (). See: https://bugzilla.kernel.org/show_bug.cgi?id=38162



Reported-by: David Hill <hilld@binarystorm.net>
Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>