octeontx2-af: Allow freeing single TLx Tx schedule queue

The default behavior was to free all the TLx Tx schedule
queues. This patch adds support for freeing a single Tx
schedule queue if TXSCHQ_FREE_ALL flag is not set.

Signed-off-by: Krzysztof Kanas <kkanas@marvell.com>
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>