atomisp: Make sure acceleration fw gets freed when closing the device

atomisp: Make sure acceleration fw gets freed when closing the device

BZ: 15864

In the case the client has requested to load acceleration firmware but
hasn't asked to unload it before closing the device, the resources
reserved for the fw haven't been released.

Change-Id: I23a9832167392dea4b2c4211202a8c95b36d3251
Signed-off-by: Ilkka Koskinen <ilkka.koskinen@intel.com>
Reviewed-on: http://android.intel.com:8080/36863
Reviewed-by: Shevchenko, Andriy <andriy.shevchenko@intel.com>
Reviewed-by: Cohen, David A <david.a.cohen@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>