example: generator: add missing instance set
example: generator: add missing instance set

Patch: api: init: add instance handle
adds instance id, but for generator one branch of threads start
is missing which lead to failure of odp_init_global(). Add missing
instance id and initial missing structure initialization to zero.

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

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