arcnet: Move files out of include/linux

These #include files don't need to be in the include/linux directory
as they can be local to drivers/net/arcnet/

Move them and update the #include statements.

Update the MAINTAINERS file pattern by deleting arcdevice from the
NETWORKING block as arcnet is currently unmaintained.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
diff --git a/drivers/net/arcnet/arc-rawmode.c b/drivers/net/arcnet/arc-rawmode.c
index 59b3083..35a747a 100644
--- a/drivers/net/arcnet/arc-rawmode.c
+++ b/drivers/net/arcnet/arc-rawmode.c
@@ -33,7 +33,8 @@
 #include <net/arp.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
-#include <linux/arcdevice.h>
+
+#include "arcdevice.h"
 
 static void rx(struct net_device *dev, int bufnum,
 	       struct archdr *pkthdr, int length);