cxgb4: fix missed high priority region calculation

commit c2193999 ("cxgb4: add support for high priority filters")
has missed considering high priority region calculation in some code
paths. This patch fixes them.

Fixes: c2193999

 ("cxgb4: add support for high priority filters")
Signed-off-by: Shahjada Abul Husain <shahjada@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>