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/cmd/ubifs.c b/cmd/ubifs.c
index e798b83..a26b653 100644
--- a/cmd/ubifs.c
+++ b/cmd/ubifs.c
@@ -14,6 +14,7 @@
 #include <common.h>
 #include <config.h>
 #include <command.h>
+#include <log.h>
 #include <ubifs_uboot.h>
 
 static int ubifs_initialized;