net: airoha: Fix lan4 support in airoha_qdma_get_gdm_port()

EN7581 SoC supports lan{1,4} ports on MT7530 DSA switch. Fix lan4
reported value in airoha_qdma_get_gdm_port routine.

Fixes: 23020f0 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250304-airoha-eth-fix-lan4-v1-1-832417da4bb5@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: LorenzoBianconi

drivers/net/ethernet/airoha/airoha_eth.c

@@ -589,7 +589,7 @@ static int airoha_qdma_get_gdm_port(struct airoha_eth *eth,
 
 	sport = FIELD_GET(QDMA_ETH_RXMSG_SPORT_MASK, msg1);
 	switch (sport) {
-	case 0x10 ... 0x13:
+	case 0x10 ... 0x14:
 		port = 0;
 		break;
 	case 0x2 ... 0x4: