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/video/mx3fb.c b/drivers/video/mx3fb.c
index a984443..4b8712f 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -7,6 +7,7 @@
  */
 #include <common.h>
 #include <env.h>
+#include <log.h>
 #include <malloc.h>
 #include <video_fb.h>