treewide: Ignore non-ethernet devices

These are not regular ethernet devices that use INET protocols. We can
ignore them as they just produce journal spam otherwise.

Tested: Verified that our MCTP interfaces are no longer reported as
objects and that our NCSI and ETH interfaces are still added.

Change-Id: Idd5723e443b358fe76f039bcc4ce70390824094d
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/ethernet_interface.cpp b/src/ethernet_interface.cpp
index a2d123d..e4108f3 100644
--- a/src/ethernet_interface.cpp
+++ b/src/ethernet_interface.cpp
@@ -11,6 +11,7 @@
 #include <fmt/format.h>
 #include <linux/rtnetlink.h>
 #include <net/if.h>
+#include <net/if_arp.h>
 
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/lg2.hpp>
@@ -563,6 +564,7 @@
         mac.emplace(ToAddr<ether_addr>{}(macStr));
     }
     auto info = AllIntfInfo{InterfaceInfo{
+        .type = ARPHRD_ETHER,
         .idx = 0, // TODO: Query the correct value after creation
         .flags = 0,
         .name = intfName,