Add `debug.adc` and option DEBUG

The GNAT configuration file `debug.adc` has Assertion_Policy Debug
enabled to compile `pragma Debug` code. If `DEBUG` is set to `1`
during build, `debug.adc` is used instead of the default `gnat.adc`.

Change-Id: If5b52f5251cae7deed7aca2765f9b5db1c148fb7
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20558
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
2 files changed