Modify DPM KEYGUARD_DISABLE_SECURE_CAMERA restriction

* 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.
* Modified the API setKeyguardDisabledFeatures to be callable
  on the parent profile for restriction KEYGUARD_DISABLE_SECURE_CAMERA.

Bug: 148656201
Test: Manual testing with TestDPC
      atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testSetKeyguardDisabledFeatures
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSetKeyguardDisabledFeatures
      atest com.android.cts.devicepolicy.MixedManagedProfileOwnerTest#testSetKeyguardDisabledFeatures
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSetKeyguardDisabledFeaturesLogged

Change-Id: I13984193e24b8745686e48c9c58ebee40a204fc7