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/lib/qsort.c b/lib/qsort.c
index f63d4ef..2f18588 100644
--- a/lib/qsort.c
+++ b/lib/qsort.c
@@ -15,6 +15,7 @@
  * calculation, as well as to reduce the generated code size with
  * bcc and gcc. */
 
+#include <log.h>
 #include <linux/types.h>
 #include <common.h>
 #include <exports.h>