Add flag to globally override updateable apexes' min_sdk_version

Override all mainline updateable apexes' min_sdk_version to same version to get a single shared native lib version on DCLA.

Test: Run "vendor/google/build/go/mainline_go_modules_arm.sh" and inspect built apexes
Bug: 212609891
Change-Id: I8edf09ca3c91ee52e9c2138c71d9b155b4448f66
Merged-In: I8edf09ca3c91ee52e9c2138c71d9b155b4448f66