ci: Drop the custom db820c kernel/dtb from the kernel+rootfs.

We use the CI-built kernel+rootfs these days.  I haven't bumped image tags
because the files are definitely unused, and I'm rebuilding it all in the
next commit.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9955>

.gitlab-ci/container/lava_build.sh

@@ -250,29 +250,6 @@ pushd /lava-files/rootfs-${DEBIAN_ARCH}
 popd
 
 if [ ${DEBIAN_ARCH} = arm64 ]; then
-    # Pull down a specific build of qcomlt/release/qcomlt-5.4 8c79b3d12355
-    # ("Merge tag 'v5.4.23' into release/qcomlt-5.4"), where I used the
-    # .config from
-    # http://snapshots.linaro.org/96boards/dragonboard820c/linaro/debian/457/config-5.4.0-qcomlt-arm64
-    # with the following merged in:
-    #
-    # CONFIG_DRM=y
-    # CONFIG_DRM_MSM=y
-    # CONFIG_ATL1C=y
-    #
-    # Reason: 5.5 has a big stack of oopses and warns on db820c.  4.14-5.4
-    # linaro kernel binaries (see above .config link) have these as modules
-    # and distributed the modules only in the debian system, not the initrd,
-    # so they're very hard to extract (involving simg2img and loopback
-    # mounting).  4.11 is missing d72fea538fe6 ("drm/msm: Fix the check for
-    # the command size") so it can't actually run fredreno.  qcomlt-4.14 is
-    # unstable at boot (~10% instaboot rate).  The 5.4 qcomlt kernel with msm
-    # built in seems like the easiest way to go.
-    wget https://people.freedesktop.org/~anholt/qcomlt-5.4-msm-build/Image.gz -O Image.gz \
-         -O /lava-files/db820c-kernel
-    wget https://people.freedesktop.org/~anholt/qcomlt-5.4-msm-build/apq8096-db820c.dtb \
-         -O /lava-files/db820c.dtb
-
     # Make a gzipped copy of the Image for db410c.
     gzip -k /lava-files/Image