Modify LockScreenPolicyFragment in TestDPC

* Introduced new logic that allows the profile owner of an
  organization-owned device (COPE PO) to set the restriction
  KEYGUARD_DISABLE_SECURE_CAMERA on the parent profile.

Bug: 148656201
Test: Manual testing with TestDPC
Change-Id: Ic6c63b0b566b875420eaaa3d6195494865bdf9ca

Author: acjohnstong

app/src/main/java/com/afwsamples/testdpc/policy/keyguard/LockScreenPolicyFragment.java

@@ -80,7 +80,6 @@ abstract static class Keys {
 
         static final Set<String> NOT_APPLICABLE_TO_PARENT
                 = new HashSet<>(Arrays.asList(new String[] {
-            KEYGUARD_DISABLE_SECURE_CAMERA,
             KEYGUARD_DISABLE_SECURE_NOTIFICATIONS,
             KEYGUARD_DISABLE_UNREDACTED_NOTIFICATIONS,
         }));

app/src/main/res/xml/lock_screen_preferences.xml

@@ -71,7 +71,6 @@
         <com.afwsamples.testdpc.common.preference.DpcSwitchPreference
             android:key="keyguard_disable_secure_camera"
             android:title="@string/keyguard_disable_secure_camera"
-            testdpc:admin="deviceOwner"
             testdpc:minSdkVersion="L" />
         <com.afwsamples.testdpc.common.preference.DpcSwitchPreference
             android:key="keyguard_disable_secure_notifications"