meson/gxl: Add tool to create bl31 bootable images
...
GXL platforms need to have a specific header at the beginning of bl31
image to be able to boot. This adds a tool to create that and calls it at
build time.
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
Remi Pommarel
committed
on 2 Apr 2019