mlxsw: spectrum_kvdl: Add support for linear division resources

The linear part of the KVD memory is sub-divided into multiple parts. This
patch exposes this internal partitions via the resource interface.

Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>