Make use of user/system includes more consistent

Make codebase consistent in its use of #include "" syntax for
user includes and #include <> syntax for system includes.

Fixes ARM-software/tf-issues#65

Change-Id: If2f7c4885173b1fd05ac2cde5f1c8a07000c7a33
diff --git a/services/spd/tspd/tspd_pm.c b/services/spd/tspd/tspd_pm.c
index 4ebafc7..6a07aa2 100644
--- a/services/spd/tspd/tspd_pm.c
+++ b/services/spd/tspd/tspd_pm.c
@@ -39,8 +39,8 @@
 #include <bl31.h>
 #include <bl32.h>
 #include <psci.h>
-#include <tspd_private.h>
 #include <debug.h>
+#include "tspd_private.h"
 
 /*******************************************************************************
  * The target cpu is being turned on. Allow the TSPD/TSP to perform any actions