Revert "net: gptp: Fix announce message len"

This reverts commit 6b644dff67.

Reason: breaks Peer-to-Peer gPTP connection. A better solution should be
found to handle the optional TLV on the announce message (chapter 10.5.1
IEEE 802.1AS-2011)

Signed-off-by: Mario Paja <mario.paja@zal.aero>

subsys/net/l2/ethernet/gptp/gptp_messages.h

@@ -68,7 +68,7 @@ extern "C" {
 #define GPTP_ANNOUNCE_LEN(pkt) \
 	(sizeof(struct gptp_hdr) + sizeof(struct gptp_announce) \
 	 + ntohs(GPTP_ANNOUNCE(pkt)->tlv.len) \
-	 - sizeof(struct gptp_path_trace_tlv))
+	 - sizeof(struct gptp_path_trace_tlv) + 4)
 
 #define GPTP_CHECK_LEN(pkt, len) \
 	((GPTP_PACKET_LEN(pkt) != len) && (GPTP_VALID_LEN(pkt, len)))