net: prestera: acl: use proper mask for port selector

[ Upstream commit 1e20904e ]

Adjusted as per packet processor documentation.
This allows to properly match 'indev' for clsact rules.

Fixes: 47327e19

 ("net: prestera: acl: migrate to new vTCAM api")

Signed-off-by: Maksym Glubokiy <maksym.glubokiy@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>