accel/ivpu: Fix race condition when mapping dmabuf

accel/ivpu: Fix race condition when mapping dmabuf

Fix a race that can occur when multiple jobs submit the same dmabuf.
This could cause the sg_table to be mapped twice, leading to undefined
behavior.

Fixes: e0c0891cd63b ("accel/ivpu: Rework bind/unbind of imported buffers")
Signed-off-by: Wludzik, Jozef <jozef.wludzik@intel.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://lore.kernel.org/r/20251014071725.3047287-1-karol.wachowski@linux.intel.com