Merge branch 'add support for batched ops in LPM trie'

Pedro Tammela says:

====================

The patch itself is straightforward thanks to the infrastructure that is
already in-place.

The tests follows the other '*_map_batch_ops' tests with minor tweaks.

v1 -> v2:
Fixes for checkpatch warnings
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>