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/freescale/common/ics307_clk.c b/board/freescale/common/ics307_clk.c
index f1e60cf..2143395 100644
--- a/board/freescale/common/ics307_clk.c
+++ b/board/freescale/common/ics307_clk.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <asm/io.h>
 
 #include "ics307_clk.h"