mlxsw: core: Fix flex keys scratchpad offset conflict

IP_TTL, IP_ECN and IP_DSCP are using the same offset within the
scratchpad as L4 ports. Fix this by shifting all up.

Fixes: 5f57e090 ("mlxsw: acl: Add ip ttl acl element")
Fixes: i80d0fe4710c ("mlxsw: acl: Add ip tos acl element")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>