Specify LOCAL_INSTALLED_MODULE_STEM for prebuilt_etc.

Otherwise the recovery variant gets installed with `.recovery` suffix.

Bug: 112780007
Test: Build with the mke2fs.conf change (using Android.bp to install
      mke2fs.conf). Check the installed filenames (under normal boot and
      recovery both).
Change-Id: I882be2fa07b530667a2dafc2bfe18730a42c4c08
diff --git a/android/prebuilt_etc.go b/android/prebuilt_etc.go
index 12fefab..046512f 100644
--- a/android/prebuilt_etc.go
+++ b/android/prebuilt_etc.go
@@ -103,6 +103,7 @@
 			fmt.Fprintln(w, "LOCAL_MODULE_TAGS := optional")
 			fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", p.sourceFilePath.String())
 			fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", "$(OUT_DIR)/"+p.installDirPath.RelPathString())
+			fmt.Fprintln(w, "LOCAL_INSTALLED_MODULE_STEM :=", name)
 			if p.additionalDependencies != nil {
 				fmt.Fprint(w, "LOCAL_ADDITIONAL_DEPENDENCIES :=")
 				for _, path := range *p.additionalDependencies {