isEthernet() - ARPHRD_PPP does not require ethernet headers

(this is required to make ipv6 tethering work with at least S.LSI modems)

Test: TreeHugger
Bug: 207057951
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ic178db928ec7f74f69d7d4739b3b8439ff026625
1 file changed