Add fs_config_files/fs_config_dirs/build_prop to system_dlkm

system_dlkm.img contains these metadata files in addition to the .ko
files. This CL pacakges these files via the following
1. Hardcode the deps in filesystem_creator.go, since these are auto
   included by kati packaging system
2. Set partition type on the system_dlkm filesystem and
   system_dlkm_specific: true on the prebuilt kernel modules. This
   ensures that the partition based packaging filter does not cause
   these files to be skipped.

Test: m soong_generated_system_dlkm_filesystem_test
KATI only installed file(s):
  etc/NOTICE.xml.gz

Change-Id: I367f3c662f5e5bcd6cf452905b599e6725281c81