system_dlkm_image produces staging_archive and modules.load
files. Also download them and put them as part of distribution
when building against downloaded prebuilts.

With system_dlkm_staging_archive.tar.gz from GKI
piped to the device's system_dlkm rule, instead
of creating the staging directory, unarchive the archive
and build system_dlkm from there.

As part of this change, kernel_images now also
accept these arguments:
- system_dlkm_modules_list
- system_dlkm_modules_blocklist
- system_dlkm_props

... which corresponds to the upper-case version of the build configs,
respectively. Their semantics are the same as the build configs.
Unlike vendor_dlkm_*:
- system_dlkm_modules_list falls back to modules_list if not set
- system_dlkm_modules_blocklist falls back to modules_blocklist if not set

Test: build slider_images_system_dlkm_image with build_system_dlkm=True
Bug: 233401974
Bug: 238786592

Change-Id: Ie9a2073d571b23eee58764ef9ced0976e5fa9622
Signed-off-by: Yifan Hong <elsk@google.com>