Make bridge interface as Ethernet interface (#33236)

Some devices neither have WAN nor eth interface but use a bridge
interface.

Consider bridge interface as Ethernet, so these devices can use bridge
interface.

Co-authored-by: Céleste Cote <celeste.cote@rtone.fr>
Co-authored-by: Andrei Litvin <andy314@gmail.com>

src/platform/Linux/ConnectivityUtils.cpp

diff --git a/src/platform/Linux/ConnectivityUtils.cpp b/src/platform/Linux/ConnectivityUtils.cpp
index 8084cec..1b12bf5 100644
--- a/src/platform/Linux/ConnectivityUtils.cpp
+++ b/src/platform/Linux/ConnectivityUtils.cpp
@@ -272,6 +272,10 @@
         if (ioctl(sock, SIOCETHTOOL, &ifr) != -1)
             ret = InterfaceTypeEnum::kEthernet;
     }
+    else if (strncmp(ifname, "br", 2) == 0)
+    {
+        ret = InterfaceTypeEnum::kEthernet;
+    }
 
     close(sock);