Add unlisted SEMCO3RD mac address

Confirmed with https://www.wireshark.org/tools/oui-lookup.html

 08:C5:E1 SamsungE	Samsung Electro-Mechanics(Thailand)

Change-Id: Ief2ec0a19c554aeb4266a64cd58aec56baf9cfe5
diff --git a/macloader/macaddr_mappings.h b/macloader/macaddr_mappings.h
index 9cd4a19..1a6fbc8 100644
--- a/macloader/macaddr_mappings.h
+++ b/macloader/macaddr_mappings.h
@@ -105,6 +105,7 @@
     .type = SEMCO3RD,
     .macaddrs = {
         "04:d6:aa",
+        "08:c5:e1",
         "24:18:1d",
         "2c:0e:3d",
         "30:07:4d",