gitlab-ci: Re-add kernels for bare-metal

I mistakenly removed what I thought were remnants of when Freedreno used LAVA for their DUTs. lava_arm.sh is used for baremetal, so re-add that code.

Signed-off-by: Tomeu Vizoso tomeu.vizoso@collabora.com Fixes: dcd171f5 ("gitlab-ci: More stable URL for kernel and ramdisk artifacts, for LAVA")