pvmfw binary should not be installable.

It won't run as an application, it needs to be converted to a raw binary
and run in a VM.

Bug: 223166344
Test: Ran unprotected VM under crosvm.
Change-Id: I19642fd3d473ca60678caaefd82c5de4d47eab1c
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 3e45454..c90f262 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -39,6 +39,7 @@
     system_shared_libs: ["libc"],
     stl: "none",
     linker_scripts: ["image.ld"],
+    installable: false,
     enabled: false,
     target: {
         android_arm64: {