net/mlx5: add TOS and TTL flower match and tunnel keys

net/mlx5: add TOS and TTL flower match and tunnel keys

This patch is a preparation for adding the type-of-service and
time-to-live IP header fields support on E-Switch. There are
two types of keys added - one for match pattern, other for
tunnel encapsulation header.

This issue is critical for some Open VSwitch configuration
on overlayed (tunneled) networks, where the tos field can be
inherited from outer header to inner header.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>