[vbmeta] Raplace avb descriptor consts with AvbDescriptorTag

Replaces the consts with the enum from libavb.

Bug: 279557218
Test: atest libvbmeta_rust.test
Change-Id: I35ac5bd24ad15e7f953001adbb4e3eac5cb50512
diff --git a/libs/avb/Android.bp b/libs/avb/Android.bp
index 7bfea3f..3a671e2 100644
--- a/libs/avb/Android.bp
+++ b/libs/avb/Android.bp
@@ -11,7 +11,9 @@
     source_stem: "bindings",
     bindgen_flags: [
         "--size_t-is-usize",
+        "--constified-enum-module AvbDescriptorTag",
         "--default-enum-style rust",
+        "--allowlist-type=AvbDescriptorTag",
         "--allowlist-function=.*",
         "--allowlist-var=AVB.*",
         "--use-core",