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/watchdog/ast_wdt.c b/drivers/watchdog/ast_wdt.c
index fe2f6be..7e11465 100644
--- a/drivers/watchdog/ast_wdt.c
+++ b/drivers/watchdog/ast_wdt.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <log.h>
 #include <wdt.h>
 #include <asm/io.h>
 #include <asm/arch/wdt.h>