Return DISABLED_FOR_USER in network/eid availability if not admin user

The correct return when checking for the SIM status field availability
for non-admin users is DISABLED_FOR_USER.

Bug: 395714454
Test: atest MobileNetworkEidPreferenceControllerTest
Flag: EXEMPT bugfix

Change-Id: I7edd213c849fcfcd45b63ed4dc1ee877b53374f7