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/advantech/imx8qm_rom7720_a1/spl.c b/board/advantech/imx8qm_rom7720_a1/spl.c
index 21ebd5d..54f48b9 100644
--- a/board/advantech/imx8qm_rom7720_a1/spl.c
+++ b/board/advantech/imx8qm_rom7720_a1/spl.c
@@ -6,6 +6,7 @@
 #include <dm.h>
 #include <image.h>
 #include <init.h>
+#include <log.h>
 #include <spl.h>
 #include <fsl_esdhc.h>