FS-7499: move fir and pli into the normal rtcp code so it can be bundled with a report block per the rfc

src/include/switch_types.h

@@ -917,6 +917,13 @@ typedef struct {
 #pragma pack(push, r1, 1)
 #endif
 
+typedef struct switch_rtcp_sdes_unit_s {
+	unsigned char type;
+	unsigned char length;
+	char value[];
+} switch_rtcp_sdes_unit_t;
+
+
 #if SWITCH_BYTE_ORDER == __BIG_ENDIAN
 typedef struct switch_rtcp_hdr_s {
 	unsigned version:2;			/* protocol version                  */