Auto-generate vendor ramdisk and boot image

They both still have a number of deficiences vs the make-built ones,
but this is a start.

Bug: 377563622
Test: Presubmits
Change-Id: If3329ae44633b00a8c2c2d15e3574087f74efe88
diff --git a/fsgen/fsgen_mutators.go b/fsgen/fsgen_mutators.go
index 0d18660..12f9956 100644
--- a/fsgen/fsgen_mutators.go
+++ b/fsgen/fsgen_mutators.go
@@ -146,7 +146,8 @@
 					"fs_config_files_odm_dlkm": defaultDepCandidateProps(ctx.Config()),
 					"odm_dlkm-build.prop":      defaultDepCandidateProps(ctx.Config()),
 				},
-				"ramdisk": {},
+				"ramdisk":        {},
+				"vendor_ramdisk": {},
 			},
 			fsDepsMutex:                     sync.Mutex{},
 			moduleToInstallationProps:       map[string]installationProperties{},