drm/xe: Avoid the OOM killer on buffer object memory allocation

Rather than invoking the OOM killer on buffer object memory
allocations and validations, have the allocations fail and
pass the error to user-space if applicable.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: drm/xe/kernel#2701


Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241031153732.164995-2-thomas.hellstrom@linux.intel.com