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/simplefb.c b/drivers/video/simplefb.c
index 1679d20..0c5b40c 100644
--- a/drivers/video/simplefb.c
+++ b/drivers/video/simplefb.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <fdtdec.h>
 #include <fdt_support.h>
+#include <log.h>
 #include <video.h>
 
 static int simple_video_probe(struct udevice *dev)