Set min_sdk_version to be part of mainline modules

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: I20d66fa7d5669412444d5e15eb23c9bfa6f35500
Change-Id: I20d66fa7d5669412444d5e15eb23c9bfa6f35500
(cherry picked from commit 856e8ebc1528b347f63d765611946e8a756a8fc1)