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/drivers/io/io_fip.c b/drivers/io/io_fip.c
index 1eb76fa..3a5d220 100644
--- a/drivers/io/io_fip.c
+++ b/drivers/io/io_fip.c
@@ -33,12 +33,12 @@
 #include <errno.h>
 #include <string.h>
 #include <assert.h>
-#include "platform.h"
-#include "firmware_image_package.h"
-#include "io_storage.h"
-#include "io_driver.h"
-#include "io_fip.h"
-#include "debug.h"
+#include <platform.h>
+#include <firmware_image_package.h>
+#include <io_storage.h>
+#include <io_driver.h>
+#include <io_fip.h>
+#include <debug.h>
 
 /* Useful for printing UUIDs when debugging.*/
 #define PRINT_UUID2(x)								\
diff --git a/drivers/io/io_memmap.c b/drivers/io/io_memmap.c
index 40b8e9a..5685be1 100644
--- a/drivers/io/io_memmap.c
+++ b/drivers/io/io_memmap.c
@@ -30,9 +30,9 @@
 
 #include <assert.h>
 #include <string.h>
-#include "io_storage.h"
-#include "io_driver.h"
-#include "debug.h"
+#include <io_storage.h>
+#include <io_driver.h>
+#include <debug.h>
 
 /* As we need to be able to keep state for seek, only one file can be open
  * at a time. Make this a structure and point to the entity->info. When we
diff --git a/drivers/io/io_semihosting.c b/drivers/io/io_semihosting.c
index 14ec687..c8013bc 100644
--- a/drivers/io/io_semihosting.c
+++ b/drivers/io/io_semihosting.c
@@ -29,9 +29,9 @@
  */
 
 #include <assert.h>
-#include "io_storage.h"
-#include "io_driver.h"
-#include "semihosting.h"
+#include <io_storage.h>
+#include <io_driver.h>
+#include <semihosting.h>