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: I6eb7ebc0003fc60ef03abdec006af532fc3315f5
Merged-In: I09dc5392655baba60ec6f3f94f0e14496fc6edc9
Change-Id: I09dc5392655baba60ec6f3f94f0e14496fc6edc9
1 file changed