umd: open source compiler code

Release DLA1.2.0 compiler source code

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: Mitch Harwell <mharwell@nvidia.com>
Signed-off-by: Gunjan Mehta <gmehta@nvidia.com>
Signed-off-by: Ken Adams <kadams@nvidia.com>
Signed-off-by: Arvind M <am@nvidia.com>

doc: add compiler features and LP support doc

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>