[PORT FROM R2] atomisp: CSS tried to free memory that was already freed

[PORT FROM R2] atomisp: CSS tried to free memory that was already freed

BZ: 17272

Some pointers within the CSS code were not being initialized
and reset correctly, due to which memory allocation/free-up
caused warnings. This patch fixes these cases. A new function
is added to properly uninitialize the sh_css_sp module.

Change-Id: I885a7aeb2b77197562bc468a673c2653cc30f3fc
Orig-Change-Id: I98370340392d3b7aca2f5c63403d3fbfe17164bd
Signed-off-by: Lokesh Gupta <lokesh.gupta@intel.com>
Reviewed-on: http://android.intel.com:8080/23911
Reviewed-by: Wang, Wen W <wen.w.wang@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: Cohen, David A <david.a.cohen@intel.com>
Reviewed-by: Toivonen, Tuukka <tuukka.toivonen@intel.com>
Reviewed-by: Von Oerthel, Jurgen <jurgen.von.oerthel@intel.com>
Reviewed-by: Kruger, Jozef <jozef.kruger@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
Reviewed-on: http://android.intel.com:8080/28011
Reviewed-by: Tuominen, TeemuX <teemux.tuominen@intel.com>