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/common/image.c b/common/image.c
index 9e4e23c..e1ca1a7 100644
--- a/common/image.c
+++ b/common/image.c
@@ -12,6 +12,7 @@
 #include <cpu_func.h>
 #include <env.h>
 #include <lmb.h>
+#include <log.h>
 #include <malloc.h>
 #include <asm/cache.h>
 #include <u-boot/crc.h>