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/cpu.c b/test/dm/cpu.c
index def9b64..46683d8 100644
--- a/test/dm/cpu.c
+++ b/test/dm/cpu.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <log.h>
 #include <dm/test.h>
 #include <dm/uclass-internal.h>
 #include <cpu.h>