[vm tool] Introduce check-feature-enabled

Introduce this command to allow host to query feature (such as
com.android.kvm.LLPVM_CHANGES) is enabled on device. Implement this in
libavf_features, so that virtmrg can share code.

Bug: 325630143
Test: Inspect output of vm check-feature-enabled
com.android.kvm.LLPVM_CHANGES

Change-Id: I9f11f6d8a98e1df6926492edee2152908c770e73
diff --git a/vm/Android.bp b/vm/Android.bp
index 04aff5e..c1d9b6b 100644
--- a/vm/Android.bp
+++ b/vm/Android.bp
@@ -12,6 +12,7 @@
     rustlibs: [
         "android.system.virtualizationservice-rust",
         "libanyhow",
+        "libavf_features",
         "libbinder_rs",
         "libclap",
         "libenv_logger",