Remove manual pregrants for SystemCaptionsService (handled via roles)

DefaultPermissionGrantPolicy was granting the RECORD_AUDIO permission
to the package that provides SystemCaptionsService. This permission is
already managed via roles; specifically it is set in the
`SYSTEM_AUDIO_INTELLIGENCE` role in
PermissionController/res/xml/roles.xml. Therefore the code performing
the pre-grant manually in DefaultPermissionGrantPolicy can be removed.

Bug: 222231605
Test: adb shell dumpsys package com.google.android.as
Test: atest GtsPermissionTestCases:com.google.android.permission.gts.DefaultPermissionGrantPolicyTest#testDefaultGrantsWithRemoteExceptions
Change-Id: I57be6ca431aa00b01ddb14674f555999cdf13acf

services/core/java/com/android/server/pm/permission/DefaultPermissionGrantPolicy.java

@@ -57,7 +57,6 @@ import android.provider.Telephony.Sms.Intents;
 import android.security.Credentials;
 import android.speech.RecognitionService;
 import android.telephony.TelephonyManager;
-import android.text.TextUtils;
 import android.util.ArrayMap;
 import android.util.ArraySet;
 import android.util.Log;
@@ -909,14 +908,6 @@ final class DefaultPermissionGrantPolicy {
         grantSystemFixedPermissionsToSystemPackage(pm, "com.android.sharedstoragebackup", userId,
                 STORAGE_PERMISSIONS);
 
-        // System Captions Service
-        String systemCaptionsServicePackageName =
-                mContext.getPackageManager().getSystemCaptionsServicePackageName();
-        if (!TextUtils.isEmpty(systemCaptionsServicePackageName)) {
-            grantPermissionsToSystemPackage(pm, systemCaptionsServicePackageName, userId,
-                    MICROPHONE_PERMISSIONS);
-        }
-
         // Bluetooth MIDI Service
         grantSystemFixedPermissionsToSystemPackage(pm,
                 MidiManager.BLUETOOTH_MIDI_SERVICE_PACKAGE, userId,