Activate Telephony Service Handle Caching

The infrastructure for telephony handle caching was checked in in
ag/10255108, but disabled due to changes that needed to be made in AOSP.
This CL activates the caching.

Test: atest PhoneSubInfoControllerTest
Test: atest DcTrackerTest
Test: atest CellBroadcastConfigTest
Bug: 140788621
Change-Id: I42c829a07f9192ccbedef38e835019804eb20978

telephony/java/android/telephony/TelephonyManager.java

@@ -13135,7 +13135,7 @@ public class TelephonyManager {
     */
     static IPhoneSubInfo getSubscriberInfoService() {
         // Keeps cache disabled until test fixes are checked into AOSP.
-        if (true) {
+        if (!sServiceHandleCacheEnabled) {
             return IPhoneSubInfo.Stub.asInterface(
                 TelephonyFrameworkInitializer
                         .getTelephonyServiceManager()
@@ -13169,7 +13169,7 @@ public class TelephonyManager {
     */
     static ISub getSubscriptionService() {
         // Keeps cache disabled until test fixes are checked into AOSP.
-        if (true) {
+        if (!sServiceHandleCacheEnabled) {
             return ISub.Stub.asInterface(
                     TelephonyFrameworkInitializer
                             .getTelephonyServiceManager()
@@ -13203,7 +13203,7 @@ public class TelephonyManager {
     */
     static ISms getSmsService() {
         // Keeps cache disabled until test fixes are checked into AOSP.
-        if (true) {
+        if (!sServiceHandleCacheEnabled) {
             return ISms.Stub.asInterface(
                     TelephonyFrameworkInitializer
                             .getTelephonyServiceManager()