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/arch/arm/mach-uniphier/dram/ddrphy-training.c b/arch/arm/mach-uniphier/dram/ddrphy-training.c
index 1decdf1..c26f563 100644
--- a/arch/arm/mach-uniphier/dram/ddrphy-training.c
+++ b/arch/arm/mach-uniphier/dram/ddrphy-training.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2015-2016 Socionext Inc.
  */
 
+#include <log.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/errno.h>