common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/ax88180.c b/drivers/net/ax88180.c
index 261fde0..d13eb11 100644
--- a/drivers/net/ax88180.c
+++ b/drivers/net/ax88180.c
@@ -39,6 +39,7 @@
  */
 #include <common.h>
 #include <command.h>
+#include <log.h>
 #include <net.h>
 #include <malloc.h>
 #include <linux/mii.h>