Refactor decision logic out of storage classes (1/2)

To make the storage classes more generic, this CL refactors
RecentPermissionsDecisionStorage to be more generic. This CL is just a
rename to make the actual functional changes more clear in the follow up
CL.

Bug: 205642821
Test: atest PermissionControllerMockingTests
Change-Id: I261d17c64f61959b10363db5133a4d09b3c84f51
12 files changed