Create prebuilt kernel module for vendor_ramdisk partition

To correctly install *.ko files to the vendor_ramdisk partition.

Test: m soong_generated_vendor_ramdisk_filesystem_test
Bug: 381104942
Change-Id: Ib058a0f6893eaa273dfd609749a6417982cf057e
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index e8b0a4f..edf7d86 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -321,7 +321,7 @@
 		}
 	}
 
-	if android.InList(partitionType, dlkmPartitions) {
+	if android.InList(partitionType, append(dlkmPartitions, "vendor_ramdisk")) {
 		f.createPrebuiltKernelModules(ctx, partitionType)
 	}
 
@@ -398,6 +398,7 @@
 		System_dlkm_specific *bool
 		Vendor_dlkm_specific *bool
 		Odm_dlkm_specific    *bool
+		Vendor_ramdisk       *bool
 		Load_by_default      *bool
 		Blocklist_file       *string
 	}{
@@ -430,6 +431,12 @@
 		if blocklistFile := ctx.Config().ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse.OdmKernelBlocklistFile; blocklistFile != "" {
 			props.Blocklist_file = proptools.StringPtr(blocklistFile)
 		}
+	case "vendor_ramdisk":
+		props.Srcs = android.ExistentPathsForSources(ctx, ctx.Config().ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse.VendorRamdiskKernelModules).Strings()
+		props.Vendor_ramdisk = proptools.BoolPtr(true)
+		if blocklistFile := ctx.Config().ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse.VendorRamdiskKernelBlocklistFile; blocklistFile != "" {
+			props.Blocklist_file = proptools.StringPtr(blocklistFile)
+		}
 	default:
 		ctx.ModuleErrorf("DLKM is not supported for %s\n", partitionType)
 	}