pvmfw: Integrate buddy_system_allocator

Add support for heap allocation.

Test: atest MicrodroidTestApp
Change-Id: I6b4df790b3cd86fe29db87dd312d5c671548e607
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index b644905..71bac72 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -9,6 +9,7 @@
     srcs: ["src/main.rs"],
     edition: "2021",
     rustlibs: [
+        "libbuddy_system_allocator",
         "liblog_rust_nostd",
         "libpvmfw_embedded_key",
         "libvmbase",