atomisp: hmm: Release the spin lock before unref'ing a block object

atomisp: hmm: Release the spin lock before unref'ing a block object

BZ: 19462

hmm_bo_device_destroy_free_bo_list held a spin lock when
unreferencing a block object. Moreover, hmm_bo_release
tries to acquire the same spin lock.

In addition, reduce the time interrupts are disabled by
changing list handling.

Change-Id: I7bbb5559f8caa8d6c696040e8ec04205e30b7c90
Signed-off-by: Ilkka Koskinen <ilkka.koskinen@intel.com>
Reviewed-on: http://android.intel.com:8080/30889
Reviewed-by: Cohen, David A <david.a.cohen@intel.com>
Reviewed-by: Kruger, Jozef <jozef.kruger@intel.com>
Reviewed-by: Toivonen, Tuukka <tuukka.toivonen@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Wang, Wen W <wen.w.wang@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Tested-by: Lampila, KalleX <kallex.lampila@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>