Remove prefer_sanitize.* properties

The properties are no longer required as an APEX module is mutated with
required sanitizers which are gathered by scanning the sanitizers that
are enabled for its direct dependencies.

Bug: 124128094
Test: m on marlin
The extractor libs are found under /system/apex/com.android.media

Change-Id: I55961d400dcbac067a5c0dcecb90e399d4991a70