use_vndk_as_stable APEX shouldn't include VNDK lib

Even though a vendor APEX sets use_vndk_as_stable:true it was possible
to include a VNDK lib by directly depending on it with
native_shared_libs.

But it's contradictory to have a VNDK lib while declaring not to include
VNDK libs. It was missing since pruning dependencies on VNDK libs was
done only for transitive deps.

Added a check to reject this.

Bug: 216847402
Test: m nothing(running soong tests)
Change-Id: I8d79a434b1bfe8e563cf8968fa76830b0e582f66

apex/apex_test.go

@@ -2713,6 +2713,23 @@ func TestVendorApex(t *testing.T) {
 	ensureListNotContains(t, requireNativeLibs, ":vndk")
 }
 
+func TestVendorApex_use_vndk_as_stable_TryingToIncludeVNDKLib(t *testing.T) {
+	testApexError(t, `Trying to include a VNDK library`, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			native_shared_libs: ["libc++"], // libc++ is a VNDK lib
+			vendor: true,
+			use_vndk_as_stable: true,
+			updatable: false,
+		}
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}`)
+}
+
 func TestVendorApex_use_vndk_as_stable(t *testing.T) {
 	ctx := testApex(t, `
 		apex {