hermes_bap_pwrite() supports odd-sized packets now.   There is no
minimal packet size for 802.11.  Also, hermes_bap_pwrite() supports
odd-sized packets now.  This removes all reasons to pad the Tx data.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>