loader: Add validation for apiVersion

loader: Add validation for apiVersion

Add a check to determine if the API version being requested can be
handled by the loader.  If it can't, then we return incompatible driver.
If we can, we continue along our merry way.

An addendum is that we also bumped the Loader/ICD interface version.
This was requested by Nvidia so that the ICDs know that we pay attention
to the version in the loader.  If they don't see the new Loader/ICD
interface version, they will handle the failing on all non-1.0 API
requests.

Change-Id: Icb7dd45e754c9f6a6c8186198333bacc68077b93