FVP: Update scripts to run GPT image

Updated scripts to:
1. Build FIP with GPT support enabled
2. Create GPT image with FIP binary inside it as a partition
3. Run GPT image on FVP base platform

Change-Id: Ia43c5e20bd0f4127b8bbd3ef488b683191d21b62
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
6 files changed