selftests: mlxsw: Increase burst size for rate test

The current combination of rate and burst size does not adhere to
Spectrum-{2,3} limitation which states that the minimum burst size
should be 40% of the rate.

Increase the burst size in order to honor above mentioned limitation and
avoid intermittent failures of this test case on Spectrum-{2,3}.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/devlink_trap_policer.sh

@@ -207,7 +207,7 @@ __rate_test()
 
 	RET=0
 
-	devlink trap policer set $DEVLINK_DEV policer $id rate 1000 burst 16
+	devlink trap policer set $DEVLINK_DEV policer $id rate 1000 burst 512
 	devlink trap group set $DEVLINK_DEV group l3_drops policer $id
 
 	# Send packets at highest possible rate and make sure they are dropped