Use canAddPrivateProfile() to enable PS delete from Reset

This change adds canAddPrivateProfile() check to enable/disable
Private space delete controller in Reset options.

Matches the availability to delete private space from reset
options with the conditions used to show the private space entry point.

In Settings Reset options preference to delete private space will be
shown only when private space creation is allowed on the device or if
private space already exists on the device.

Bug: 330396315
Test: ResetOptionsDeletePrivateSpaceControllerTest
Change-Id: I63232556f7927aeb07b73e8732bbb8b1d2423456

src/com/android/settings/privatespace/PrivateSpaceMaintainer.java

@@ -287,6 +287,14 @@ public class PrivateSpaceMaintainer {
         }
     }
 
+    /**
+     * Returns true if private profile can be added to the device or if private space already
+     * exists, false otherwise.
+     */
+    public boolean isPrivateSpaceEntryPointEnabled() {
+        return mUserManager.canAddPrivateProfile() || doesPrivateSpaceExist();
+    }
+
     /** Returns true if private space exists and is running, otherwise returns false */
     @VisibleForTesting
     synchronized boolean isPrivateProfileRunning() {