feat(gxl): add support for booting from U-Boot SPL/with standard params

The arguments struct needs to be changed to remove a non-standard entry
(`scp_image_info[]`) and also makes use of a built-in arguments parser.
Since the `scp_image_info[]` entry is removed in U-Boot SPL-compatible builds,
SCP_BL2 image info is hardcoded.

Change-Id: Id3cc887c61c3b940c8a21d9da7f2b6845da51af8
Signed-off-by: Ferass El Hafidi <funderscore@postmarketos.org>
2 files changed