cc_prebuilt_library_shared does not currently support generating stubs
from API symbol_files, and therefore the symbol file was removed from
the module sdk snapshots in https://ag.corp.google.com/11394495
As part of b/275273834, the stubs will be generated from the API files
for cc_prebuilt_library_shared, so add the symbol file back to the
module sdk
Bug: 275273834
Test: m nothing --no-skip-soong-tests
Test: m art-module-sdk and verified the map.txt is copied to the zip
next to the Android.bp file
Change-Id: I9551e7b8a76ceb9db3ed0434d315b6839f5e3d54
e20c56cdf0