Add com.android.healthfitness to apex_available for...

Add com.android.healthfitness to apex_available for android.permission.flags-aconfig-java-export java_aconfig_library

Health&Fitness mainline module needs to use this flag (ag/28112536).

Bug: 364638912
Bug: 364643447
Change-Id: Ib4da0b5cdd3def5e2a4527610d56a7c2cf724481
Flag: android.permission.flags.replace_body_sensor_permission_enabled