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
diff --git a/fsgen/fsgen_mutators.go b/fsgen/fsgen_mutators.go
index e530a5b..2d4ad79 100644
--- a/fsgen/fsgen_mutators.go
+++ b/fsgen/fsgen_mutators.go
@@ -146,8 +146,14 @@
 					"com.android.vndk.v33": defaultDepCandidateProps(ctx.Config()),
 					"com.android.vndk.v34": defaultDepCandidateProps(ctx.Config()),
 				},
-				"system_dlkm": {},
-				"userdata":    {},
+				"userdata": {},
+				"system_dlkm": {
+					// these are phony required deps of the phony fs_config_dirs_nonsystem
+					"fs_config_dirs_system_dlkm":  defaultDepCandidateProps(ctx.Config()),
+					"fs_config_files_system_dlkm": defaultDepCandidateProps(ctx.Config()),
+					// build props are automatically added to `ALL_DEFAULT_INSTALLED_MODULES`
+					"system_dlkm-build.prop": defaultDepCandidateProps(ctx.Config()),
+				},
 			},
 			fsDepsMutex:               sync.Mutex{},
 			moduleToInstallationProps: map[string]installationProperties{},