Return GK_PW_HANDLE after remote LSKF verification.

Handle is returned when LSKF is set after successful verification.
It is used by SUW to add biometrics without asking for LSKF.

Bug: 272807192
Test: manual
Change-Id: I3fe6ed7fd6401421090ccd684509dfede9106076

src/com/android/settings/password/ChooseLockSettingsHelper.java

@@ -339,7 +339,7 @@ public final class ChooseLockSettingsHelper {
                 Utils.enforceSameOwner(mActivity, mUserId);
             }
 
-            if (mExternal && mReturnCredentials) {
+            if (mExternal && mReturnCredentials && !mRemoteLockscreenValidation) {
                 throw new IllegalArgumentException("External and ReturnCredentials specified. "
                         + " External callers should never be allowed to receive credentials in"
                         + " onActivityResult");