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/board/freescale/imx8qm_mek/spl.c b/board/freescale/imx8qm_mek/spl.c
index a16f88a..9dee12a 100644
--- a/board/freescale/imx8qm_mek/spl.c
+++ b/board/freescale/imx8qm_mek/spl.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <image.h>
 #include <init.h>
+#include <log.h>
 #include <spl.h>
 #include <dm/uclass.h>
 #include <dm/device.h>