[PATCH] libertas: remove bss_descriptior->networktsf

This value was parsed out, but then nowhere used ... except in
some debugfs output. I can't imagine anyone wanting to use this
value for anything real (as no other driver exports it), so
bye-bye.

Along this, made the columns of
/sys/kernel/debug/libertas_wireless/*/getscantable align again.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>