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/test/dm/rtc.c b/test/dm/rtc.c
index 7188742..88f8658 100644
--- a/test/dm/rtc.c
+++ b/test/dm/rtc.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <dm.h>
 #include <i2c.h>
+#include <log.h>
 #include <rtc.h>
 #include <asm/io.h>
 #include <asm/test.h>