Reland "Change the stem name to microdroid_precompiled_s..."

Bug: 285855150
Test: presubmit
Change-Id: I3343b7cf22165541f880fd1c88b27b0204c94c4b
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 12bb8f7..f24f31d 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -233,7 +233,7 @@
 
 se_policy_binary {
     name: "microdroid_precompiled_sepolicy",
-    stem: "precompiled_sepolicy",
+    stem: "microdroid_precompiled_sepolicy",
     srcs: [
         ":microdroid_plat_sepolicy.cil",
         ":microdroid_plat_mapping_file",