Update init.rc and fstab to normal convention

Bug: 185767624
Test: boot and see data mounted
Change-Id: Iabeca8c4c03df586ee1a65e8274e3667c2bdd2dc
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 3ace4a6..85b5e0c 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -260,7 +260,7 @@
     type: "compressed_cpio",
     symlinks: [
         {
-            target: "etc/fstab",
+            target: "etc/fstab.microdroid",
             name: "first_stage_ramdisk/fstab.microdroid",
         },
         {
@@ -272,8 +272,8 @@
 
 prebuilt_etc {
     name: "microdroid_fstab",
-    src: "fstab",
-    filename: "fstab",
+    src: "fstab.microdroid",
+    filename: "fstab.microdroid",
     installable: false,
 }