atomisp: make warnings as errors in atomisp and ov8830

atomisp: make warnings as errors in atomisp and ov8830

BZ:26628

Enabling -Werror compiler flag to show compiler warnings as errors for atomisp and ov8830 drivers

Change-Id: I4e042cadb8e674eeaaf6013c5b6eec1a32847435
Signed-off-by: Antti Laakso <antti.laakso@intel.com>
Reviewed-on: http://android.intel.com:8080/39783
Reviewed-by: Rose, James <james.rose@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Toivonen, Tuukka <tuukka.toivonen@intel.com>
Reviewed-by: Kruger, Jozef <jozef.kruger@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>