Set prebuiltCommon.installedFile for apex_set modules

apex_set modules failed to set prebuiltCommon.installedFile, which
caused LOCAL_SOONG_INSTALLED_MODULE to be empty and base_rules.mk
to create a duplicate install rule.  Set it to the path to the
apex file installed by Soong.

Bug: 204136549
Bug: 209867137
Test: m SOONG_CONFIG_art_module_source_build=false
Change-Id: Ia7fec09598823343242ebd44f1732e6bba21d027