net: calxedaxgmac: fix build due to missing __aligned definition

Include linux/compiler.h to fix build error due to missing __aligned
definition.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/drivers/net/calxedaxgmac.c b/drivers/net/calxedaxgmac.c
index 01b2eee..00e26c2 100644
--- a/drivers/net/calxedaxgmac.c
+++ b/drivers/net/calxedaxgmac.c
@@ -16,6 +16,7 @@
  */
 #include <common.h>
 #include <malloc.h>
+#include <linux/compiler.h>
 #include <linux/err.h>
 #include <asm/io.h>