headers, ax25: Add missing #include to <linux/netrom.h>, <linux/rose.h>

These headers use the ax25_address type defined in <linux/ax25.h>.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netrom.h b/include/linux/netrom.h
index 6939b32..af7313c 100644
--- a/include/linux/netrom.h
+++ b/include/linux/netrom.h
@@ -7,6 +7,8 @@
 #ifndef	NETROM_KERNEL_H
 #define	NETROM_KERNEL_H
 
+#include <linux/ax25.h>
+
 #define NETROM_MTU	236
 
 #define NETROM_T1	1