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: I58ce4d2f486dfce33b6335d45ca8070dfb4edd46
Change-Id: I58ce4d2f486dfce33b6335d45ca8070dfb4edd46
(cherry picked from commit 32563b887f4dadc443aba2884473fab01c51a3c1)