Revert "Drop prebuilt files to android source tree."

This reverts commit 3edb19f38af6e5893358ac6679096547ee6142ab.

Revert to a previous build of pvmfw, which didn't expose a bug in
microdroid_bootloader, to avoid preventing pVMs from booting, as caused
by that bug.

Bug: 217161634
Test: reverts to a previous working state
Change-Id: Ib647cf28d40790aab52ada074ef7ee772ea61f18
diff --git a/.prebuilt_info/prebuilt_info_pvmfw_pvmfw_img.asciipb b/.prebuilt_info/prebuilt_info_pvmfw_pvmfw_img.asciipb
index 85f86d0..445f731 100644
--- a/.prebuilt_info/prebuilt_info_pvmfw_pvmfw_img.asciipb
+++ b/.prebuilt_info/prebuilt_info_pvmfw_pvmfw_img.asciipb
@@ -1,6 +1,6 @@
 drops {
   android_build_drop {
-    build_id: "8194384"
+    build_id: "8191635"
     target: "u-boot_pvmfw"
     source_file: "pvmfw.img"
   }
diff --git a/pvmfw/pvmfw.img b/pvmfw/pvmfw.img
index 395513f..5e99b5f 100644
--- a/pvmfw/pvmfw.img
+++ b/pvmfw/pvmfw.img
Binary files differ