Merge branch 'mlxsw-selftests-updates'

Ido Schimmel says:

====================
selftests: mlxsw: Various updates

This patchset contains various updates to mlxsw selftests.

Patch #1 replaces open-coded compatibility checks with dedicated
helpers. These helpers are used to skip tests when run on incompatible
machines.

Patch #2 avoids spurious failures in some tests by using permanent
neighbours instead of reachable ones.

Patch #3 reduces the run time of a test by not iterating over all the
available trap policers.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>