STAGING: brcm80211 fix TX Queue overflow

Increase QLEN to avoid TX Queue overflow.
iperf testing results in poor throughput and massive reporting of:
	dhd_bus_txdata: out of bus->txq !!!

Also renamed QLEN/et al to reflect usage as TX queue parameters.
Tested with "dhd_doflow = true".

Signed-off-by: Venkat Rao <vrao@broadcom.com>
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>