Build: corstone1000: Edit the flash.bin creation cmd

Concatinating the binaries will not work with the new corstone1000
GPT image. Instead of cat command, a custom script should be called to
create the flash image.

Signed-off-by: Mohamed Omar Asaker <mohamed.omarasaker@arm.com>
Change-Id: Ib15b2496db231ce497c2a1381120ee2a947942e6
1 file changed