api: version: added implementation name str
api: version: added implementation name str

Refined version API documentation and added implementation
name string that can be used to identify the underlying
implementation at run time.

Signed-off-by: Petri Savolainen <d528fd253b9aaf78fa72edbcc6249e82047f6ce6@nokia.com>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

erachmi/odp,nmorey/odp,nmorey/odp,rsalveti/odp,nmorey/odp,dkrot/odp,mike-holmes-linaro/odp,ravineet-singh/odp,ravineet-singh/odp,kalray/odp-mppa,ravineet-singh/odp,mike-holmes-linaro/odp,erachmi/odp,erachmi/odp,mike-holmes-linaro/odp,erachmi/odp,kalray/odp-mppa,kalray/odp-mppa,rsalveti/odp,rsalveti/odp,kalray/odp-mppa,ravineet-singh/odp,dkrot/odp,mike-holmes-linaro/odp,kalray/odp-mppa,kalray/odp-mppa,nmorey/odp,dkrot/odp,rsalveti/odp,rsalveti/odp,kalray/odp-mppa,dkrot/odp