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/drivers/rtc/ds1337.c b/drivers/rtc/ds1337.c
index af94bcf..4986c96 100644
--- a/drivers/rtc/ds1337.c
+++ b/drivers/rtc/ds1337.c
@@ -14,6 +14,7 @@
 #include <common.h>
 #include <command.h>
 #include <dm.h>
+#include <log.h>
 #include <rtc.h>
 #include <i2c.h>