use stable NDK android/log.h header instead of cutils/logd.h

Change-Id: Iaf128867dd892b6756d4d0523c97caadf67d0e0f
diff --git a/pppd/utils.c b/pppd/utils.c
index 6a743ea..726657e 100644
--- a/pppd/utils.c
+++ b/pppd/utils.c
@@ -61,7 +61,7 @@
 #include "lcp.h"
 
 #ifdef ANDROID_CHANGES
-#include <cutils/logd.h>
+#include <android/log.h>
 #endif
 
 static const char rcsid[] = RCSID;