tests/functional: Add a ppc64 mac99 test

The test sequence boots from disk a mac99 machine in 64-bit mode, in
which case the CPU is a PPC 970.

The buildroot rootfs is built with config :

BR2_powerpc64=y
BR2_powerpc_970=y

and the kernel with the g5 deconfig.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-ID: <20250128212145.1186617-1-clg@redhat.com>
[thuth: Adjusted the comment about '-nographic]
Signed-off-by: Thomas Huth <thuth@redhat.com>
3 files changed