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/xilinx_emaclite.c b/drivers/net/xilinx_emaclite.c
index 4b49290..b15e551 100644
--- a/drivers/net/xilinx_emaclite.c
+++ b/drivers/net/xilinx_emaclite.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <net.h>
 #include <config.h>
 #include <dm.h>