n1sdp: change to the AA640001 layout generated by fiptool
Created by: patrik-arm
Remove the need for a specific N1SDP flash image packaging tool and switch to the fiptool from TF-A.
Change-Id: I00243a850b7f06702f1efb38d30e2e0705cf7414 Signed-off-by: Patrik Berglund patrik.berglund@arm.com