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_write.c b/fs/ext4/ext4_write.c
index ce1fddc..f22af45 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -23,6 +23,7 @@
 
 #include <common.h>
 #include <blk.h>
+#include <log.h>
 #include <malloc.h>
 #include <memalign.h>
 #include <part.h>