Remove apex_available whitelist for the extservices APEX

The marked library(ies) were available to the APEX via the
hand-written whitelist in build/soong/apex/apex.go. Trying to remove the
whitelist by adding apex_available property to the Android.bp of the
libraries.

Bug: 150999716
Test: m
Change-Id: I827d604c7e5a469a8b8a6d5a4b7917f2eaca48ca

apex/apex.go

@@ -244,18 +244,6 @@ func makeApexAvailableWhitelist() map[string][]string {
 	//
 	// Module separator
 	//
-	m["com.android.extservices"] = []string{
-		"flatbuffer_headers",
-		"liblua",
-		"libtextclassifier",
-		"libtextclassifier_hash_static",
-		"libtflite_static",
-		"libutf",
-		"tensorflow_headers",
-	}
-	//
-	// Module separator
-	//
 	m["com.android.neuralnetworks"] = []string{
 		"android.hardware.neuralnetworks@1.0",
 		"android.hardware.neuralnetworks@1.1",