Clear caller identify before registering and unregistering phone acct.

This was causing a problem with the intents broadcast from CallsManager.

Test: Ran CTS, Manual
Bug: 37430159
Change-Id: I7c7486cfe13f1465bd7fafa7ad64dc426289c987
diff --git a/src/com/android/server/telecom/TelecomServiceImpl.java b/src/com/android/server/telecom/TelecomServiceImpl.java
index d4e1096..40ba21d 100644
--- a/src/com/android/server/telecom/TelecomServiceImpl.java
+++ b/src/com/android/server/telecom/TelecomServiceImpl.java
@@ -399,7 +399,12 @@
                             enforceRegisterMultiUser();
                         }
                         enforceUserHandleMatchesCaller(account.getAccountHandle());
-                        mPhoneAccountRegistrar.registerPhoneAccount(account);
+                        final long token = Binder.clearCallingIdentity();
+                        try {
+                            mPhoneAccountRegistrar.registerPhoneAccount(account);
+                        } finally {
+                            Binder.restoreCallingIdentity(token);
+                        }
                     } catch (Exception e) {
                         Log.e(this, e, "registerPhoneAccount %s", account);
                         throw e;
@@ -418,7 +423,12 @@
                     enforcePhoneAccountModificationForPackage(
                             accountHandle.getComponentName().getPackageName());
                     enforceUserHandleMatchesCaller(accountHandle);
-                    mPhoneAccountRegistrar.unregisterPhoneAccount(accountHandle);
+                    final long token = Binder.clearCallingIdentity();
+                    try {
+                        mPhoneAccountRegistrar.unregisterPhoneAccount(accountHandle);
+                    } finally {
+                        Binder.restoreCallingIdentity(token);
+                    }
                 } catch (Exception e) {
                     Log.e(this, e, "unregisterPhoneAccount %s", accountHandle);
                     throw e;