Allow privileged apps to accept and end VOIP calls.

This change updates Telecom Service to allow privileged app invocations to accept and end VOIP calls. This functionality was requested by the accessibility team in order to support their talkback double tap gesture feature.

Bug: 353579043
Flag: com.android.server.telecom.flags.allow_system_apps_resolve_voip_calls
Test: atest TelecomServiceImplTest
Change-Id: I6da4ce827fc6c7fe732b52aaad67cff75494483d
diff --git a/flags/telecom_api_flags.aconfig b/flags/telecom_api_flags.aconfig
index 75efdfa..2dfd878 100644
--- a/flags/telecom_api_flags.aconfig
+++ b/flags/telecom_api_flags.aconfig
@@ -73,3 +73,12 @@
   description: "Formalizes the getLastKnownCellIdentity API that Telecom reliees on as a system api"
   bug: "327454165"
 }
+
+# OWNER=grantmenke TARGET=25Q2
+flag {
+  name: "allow_system_apps_resolve_voip_calls"
+  is_exported: true
+  namespace: "telecom"
+  description: "Allow system apps such as accessibility to accept and end VOIP calls."
+  bug: "353579043"
+}