selftests: mlxsw: Move IPv6 decap_error test to shared directory

Now that Spectrum-1 gained ip6gre support we can move the test out of
the Spectrum-2 directory.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/devlink_trap_tunnel_ipip6.sh → tools/testing/selftests/drivers/net/mlxsw/devlink_trap_tunnel_ipip6.sh

@@ -31,7 +31,7 @@
 # |    2001:db8:10::2/64    |
 # +-------------------------+
 
-lib_dir=$(dirname $0)/../../../../net/forwarding
+lib_dir=$(dirname $0)/../../../net/forwarding
 
 ALL_TESTS="
 	decap_error_test