Add read/write logic for SubscriptionPlan network types field

Add permissions for Phone process to access SubscriptionPlans for
meteredness

Test: manual verification
Bug: 169187737
Change-Id: Ib821590a573db87b22619cfe7ebe64c0230c5031
(cherry picked from commit 8fce85a6f8682fe61f773e6e31b5c1246001ba65)
2 files changed