Remove VNDK definition(s)

As of VNDK deprecation, any libraries that defines vndk is no longer
valid anymore. This change removes all VNDK definition(s) from modules
which was VNDK.

Bug: 328994089
Test: AOSP CF build succeeded
Change-Id: Ie13b26cb67459ab6453fac09ca7a8bab5746f0af
diff --git a/Android.bp b/Android.bp
index d376d8f..e27638f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -77,9 +77,6 @@
     defaults: ["piex_default_cflags"],
     vendor_available: true,
     product_available: true,
-    vndk: {
-        enabled: true,
-    },
     srcs: [
         "src/piex.cc",
         "src/piex_cr3.cc",