Add min_sdk_version:R to updatable apexes

APEXes introduced in R need to set min_sdk_version to ensure that they
are built against correct version of stubs (libc/liblog/...).

Bug: 152655956
Test: m
Merged-In: I4a893c34b09334eea124266287301e479b9e8a59
Change-Id: I4a893c34b09334eea124266287301e479b9e8a59
(cherry picked from commit db38a2d6)