selftests: mlxsw: Test port range occupancy on template create

Add a test that creates a tc chain template matching on both source and
destination port ranges and verifies via devlink-resource occupancy that
this does not leak port range registers, neither while the template
exists nor after it is deleted.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/e7b37b80adb7ac8b0ef20a22d7654a6656c1c545.1791294384.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>