expose bpf_syscall_wrappers to art apex

The art apex already has access to bpf_headers which includes bpf_syscall_wrappers,
but this extra line is needed to switch it away from needlessly linking libbpf_android.

Since these are header files only, this annotation is kind of pointless,
but it does turn out to be needed...

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I9e4d3373cea488080304e31ed7c8708aec988933

staticlibs/native/bpf_syscall_wrappers/Android.bp

@@ -30,6 +30,7 @@ cc_library_headers {
     min_sdk_version: "30",
     apex_available: [
         "//apex_available:platform",
+        "com.android.art.debug",
         "com.android.mediaprovider",
         "com.android.tethering",
     ],