Abstract set APIs in SubscriptionManager

Put common codes of set APIs in Subscription into an unified method.
So that later it's easier to add APIs.

Bug: 112167869
Test: unittest
Change-Id: Idd2312c98fc178f078c75937ba2d8c2e414f3c3a
Merged-In: Idd2312c98fc178f078c75937ba2d8c2e414f3c3a
1 file changed