isp: Add stats port to enable userspace 3A algorithms

Still needs some tarting up with regard enabling ports
in random orders, but all seems to be working.

interface/mmal/mmal_encodings.h

@@ -168,6 +168,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #define MMAL_ENCODING_EGL_IMAGE        MMAL_FOURCC('E','G','L','I')
 
+/** ISP image statistics format
+ */
+#define MMAL_ENCODING_BRCM_STATS       MMAL_FOURCC('S','T','A','T')
+
 /* }@ */
 
 /** \name Pre-defined audio encodings */

interface/mmal/util/mmal_il.c

@@ -688,6 +688,7 @@ static struct {
    {MMAL_ENCODING_BMP,            OMX_IMAGE_CodingBMP},
    {MMAL_ENCODING_TGA,            OMX_IMAGE_CodingTGA},
    {MMAL_ENCODING_PPM,            OMX_IMAGE_CodingPPM},
+   {MMAL_ENCODING_BRCM_STATS,     OMX_IMAGE_CodingBrcmStatistics},
    {MMAL_ENCODING_UNKNOWN,        OMX_IMAGE_CodingUnused}
 };
 

interface/vmcs_host/khronos/IL/OMX_Image.h

@@ -66,6 +66,7 @@ typedef enum OMX_IMAGE_CODINGTYPE {
 
     OMX_IMAGE_CodingTGA,
     OMX_IMAGE_CodingPPM,
+    OMX_IMAGE_CodingBrcmStatistics, /**< Statistics from the Brcm ISP */
 
     OMX_IMAGE_CodingMax = 0x7FFFFFFF
 } OMX_IMAGE_CODINGTYPE;