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/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 9adef57..c52cc40 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -22,6 +22,7 @@
 #include <blk.h>
 #include <ext_common.h>
 #include <ext4fs.h>
+#include <log.h>
 #include <malloc.h>
 #include <memalign.h>
 #include <part.h>