accel/qaic: delete qaic_bo.handle

accel/qaic: delete qaic_bo.handle

Handles are per-file, not global, so this makes no sense. Plus it's
set only after calling drm_gem_handle_create(), and drivers are not
allowed to further initialize a bo after that function has published it
already.

It is also entirely unused, which helps enormously with removing it
:-)

Since we're still holding a reference to the bo nothing bad can
happen, hence not cc: stable material.

Cc: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Cc: Carl Vanderlip <quic_carlv@quicinc.com>
Cc: linux-arm-msm@vger.kernel.org
Signed-off-by: Simona Vetter <simona.vetter@ffwll.ch>
Signed-off-by: Simona Vetter <simona.vetter@intel.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250528091307.1894940-5-simona.vetter@ffwll.ch