dsa: Include linux/if_ether.h to fix build error

Include linux/if_ether.h to fix below build errors:

CC arch/arm/mach-kirkwood/common.o
In file included from arch/arm/mach-kirkwood/common.c:19:
include/net/dsa.h: In function 'dsa_uses_dsa_tags':
include/net/dsa.h:192: error: 'ETH_P_DSA' undeclared (first use in this function) include/net/dsa.h:192: error: (Each undeclared identifier is reported only once include/net/dsa.h:192: error: for each function it appears in.) include/net/dsa.h: In function 'dsa_uses_trailer_tags':
include/net/dsa.h:197: error: 'ETH_P_TRAILER' undeclared (first use in this function) make[1]: *** [arch/arm/mach-kirkwood/common.o] Error 1
make: *** [arch/arm/mach-kirkwood] Error 2

---
 include/net/dsa.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

index b78db3c..7828ebf 100644
@@ -11,6 +11,7 @@
 #ifndef __LINUX_NET_DSA_H
 #define __LINUX_NET_DSA_H
 
+#include <linux/if_ether.h>
 #include <linux/list.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>

1.7.5.4

From: Axel Lin <[email protected]>
Date: Thu, 01 Dec 2011 16:07:18 +0800

Applied.