drop no-longer-needed apex_available clause on libhardware

codec2/vndk referenced, but did not use, libhardware. Now that
the reference is cleaned, we don't need to to export to apex's.

Bug: 221444002
Test: build, boot
Change-Id: I43bff5cab71d53d8c7422c13265f129b26ca0430
diff --git a/Android.bp b/Android.bp
index a8f4fe4..92c77fa 100644
--- a/Android.bp
+++ b/Android.bp
@@ -99,9 +99,4 @@
         },
     },
     min_sdk_version: "29",
-    apex_available: [
-        "//apex_available:platform",
-        "com.android.media.swcodec",
-        "test_com.android.media.swcodec",
-    ],
 }