fiptool: Precursor changes for Visual Studio

In order to compile the source of Fiptool using Visual Studio a number
of adjustments are required to the source.  This commit modifies the
source with changes that will be required, but makes no functional
modification.  The intent is to allow confirmation that the GCC build
is unaffected.

Change-Id: I4055bd941c646dd0a1aa2e24b940a1db3bf629ce
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
diff --git a/tools/fiptool/fiptool.h b/tools/fiptool/fiptool.h
index 4b5cdd9..d8a5d2c 100644
--- a/tools/fiptool/fiptool.h
+++ b/tools/fiptool/fiptool.h
@@ -13,6 +13,8 @@
 #include <firmware_image_package.h>
 #include <uuid.h>
 
+#include "fiptool_platform.h"
+
 #define NELEM(x) (sizeof (x) / sizeof *(x))
 
 enum {