Add build.prop for microdroid

Bug: 181728482
Test: boot microdroid, adb shell getprop
Change-Id: Ief3064661d8a2fd715a69880e4024abcc8357be2
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 8ffb3cb..5c9f144 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -41,6 +41,7 @@
     deps: [
         "init_second_stage",
         "microdroid_init_rc",
+        "microdroid_build_prop",
         "ueventd.rc",
         "libbinder",
         "libstdc++",
@@ -87,6 +88,13 @@
     installable: false, // avoid collision with system partition's init.rc
 }
 
+prebuilt_root {
+    name: "microdroid_build_prop",
+    filename: "build.prop",
+    src: "build.prop",
+    installable: false,
+}
+
 android_filesystem {
     name: "microdroid_vendor",
     use_avb: true,