Set min_sdk_version (for non-mainline files)

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.

This is second part of two CLs: covers non-mainline files

Bug: 152655956
Test: m
Change-Id: I55336e644990d3f175e0c011856b52ec600e452a