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/arndale/arndale.c b/board/samsung/arndale/arndale.c
index 9abad3f..7a8e57b 100644
--- a/board/samsung/arndale/arndale.c
+++ b/board/samsung/arndale/arndale.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <init.h>
+#include <log.h>
 #include <usb.h>
 #include <asm/gpio.h>
 #include <asm/arch/pinmux.h>