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/command_ut.c b/test/command_ut.c
index d6e6777..9837d10 100644
--- a/test/command_ut.c
+++ b/test/command_ut.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <command.h>
 #include <env.h>
+#include <log.h>
 
 static const char test_cmd[] = "setenv list 1\n setenv list ${list}2; "
 		"setenv list ${list}3\0"