devicepolicy: use typed List<String> in AIDL

Bug: 192615532
Test: m
Merged-In: I0ea1c35f7ce4dd6f6bde02874e02ed190fa2e904
Change-Id: I0ea1c35f7ce4dd6f6bde02874e02ed190fa2e904
(cherry picked from commit 57fe5105df3cba383cbc1e7ec0dc7ce427d01799)
2 files changed