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: I92c78b0930a14f2f5830d6f0873996c17d4ee44b
Change-Id: I92c78b0930a14f2f5830d6f0873996c17d4ee44b
(cherry picked from commit 3c222551)