Update setSubscriptionOverride API to allow network types

Allow 5G unmetered override via a different API than
setSubscriptionPlans. OVERRIDE_UNMETERED can be set without defining
SubscriptionPlans, but OVERRIDE_CONGESTED behavior remains the same.
Both the unmetered and congested case of setSubscriptionOverride take in
networkTypes as an additional parameter

Test: atest FrameworksTelephonyTests
Test: atest SubscriptionManagerTest
Bug: 175723642
Change-Id: Ie196db5e236e478f1c29c3dfd1ca31acc205c54b