linux-generic: schedule: use schedule time in ns
linux-generic: schedule: use schedule time in ns

In the schedule_loop the wait time is passed in units of scheduler
time. At this moment there is no difference between wait time and
odp_time, but in case if odp_time is smth different from uint64_t,
it cannot be directly passed as uint64_t. So better to pass scheduler
time as ns and convert them before entering a loop.

Reviewed-by: Petri Savolainen <d528fd253b9aaf78fa72edbcc6249e82047f6ce6@nokia.com>
Signed-off-by: Ivan Khoronzhuk <15ad2a232c436ab54d1b78ef06a09c4cd03911f0@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

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