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/samsung/smdkv310/smdkv310.c b/board/samsung/smdkv310/smdkv310.c
index 9b65023..0a57736 100644
--- a/board/samsung/smdkv310/smdkv310.c
+++ b/board/samsung/smdkv310/smdkv310.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <init.h>
+#include <log.h>
 #include <net.h>
 #include <asm/gpio.h>
 #include <asm/io.h>