Fix order of remaining platform #includes

This fix modifies the order of system includes to meet the ARM TF coding
standard. There are some exceptions to this change in order to retain
header groupings and where there are headers within #if statements.

Change-Id: Ib5b668c992d817cc860e97b29e16ef106d17e404
Signed-off-by: Isla Mitchell <isla.mitchell@arm.com>
diff --git a/plat/qemu/dt.c b/plat/qemu/dt.c
index f732a6d..c544d9f 100644
--- a/plat/qemu/dt.c
+++ b/plat/qemu/dt.c
@@ -7,8 +7,8 @@
 #include <debug.h>
 #include <libfdt.h>
 #include <psci.h>
-#include "qemu_private.h"
 #include <string.h>
+#include "qemu_private.h"
 
 static int append_psci_compatible(void *fdt, int offs, const char *str)
 {