Set min_sdk_version property

libui-types should be set min_sdk_version as well as apex_available so
that it can be depended on by mainline modules.

"apex_inherit" means this module should support every APEX. At the
moment, it means "29" because 29 is the lowest API level.

Bug: 152655956
Test: m
Change-Id: I827ec243924c0fd4c20741d72eb819f77c0b6842