Dont parse resource values behind disabled flags

This change makes it so that when we are parsing resources and there is
one behind a disabled flag we don't parse the value. This is primarily
to prevent disabled strings from ending up in the string pool.

Test: automated
Bug: 329436914
Flag: EXEMPT Aconfig not supported on host tools
Change-Id: I4d8683ac820a3fd20cd92c223464f912b0ac422d