stats: Set min_sdk_version

Modules contributing mainline modules (APK/APEX) should set
min_sdk_version as well as apex_available.

For now setting min_sdk_version doesn't change build outputs.
But build-time checks will be added soon.

Bug: 152655956
Test: m
Merged-In: Icd184c6fe06a688bd79ef6514bb49dffb706a9a1
Change-Id: Icd184c6fe06a688bd79ef6514bb49dffb706a9a1
(cherry picked from commit cc3588af)