drm/xe: Remove the xe_bo_populate() interface

Replace with xe_bo_validate() where needed. Difference is that xe_bo_validate() is interruptible, and we need to watch out for callers not yet being able to handle that. In come cases, the call to xe_bo_populate() is removed, and in those cases, the buffer object was already pinned in the relevant memory type. An interface like xe_bo_populate() should only be needed if we bind directly to system memory; otherwise TTM will populate before moving to another memory type.

Issue #81 (closed)

Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com