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/mc34vr500.c b/board/freescale/common/mc34vr500.c
index d4f0f0c..d6b4c65 100644
--- a/board/freescale/common/mc34vr500.c
+++ b/board/freescale/common/mc34vr500.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <errno.h>
 #include <i2c.h>
+#include <log.h>
 #include <power/pmic.h>
 #include <power/mc34vr500_pmic.h>