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
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index c6ce799..67ccb99 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -767,6 +767,7 @@
     min_sdk_version: "30",
     apex_available: [
         "//apex_available:platform",
+        "com.android.healthfitness",
         "com.android.permission",
         "com.android.nfcservices",
     ],