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: Idaa4c3bf2dbd8c0090c1e6681f077e63b84e9b13
Change-Id: Idaa4c3bf2dbd8c0090c1e6681f077e63b84e9b13
(cherry picked from commit 1e5505de456840204f2bf9e86f671b0f557dd532)
1 file changed