Use the module bpf_syscall_wrappers for BPF system calls

Use the versioned header library of BPF system calls and remove the
stubs.

Test: atest BpfMapTest
Change-Id: Ib178b02b7cfebaae7681609ae7c40a49cda47eeb
diff --git a/libbpf_android/Android.bp b/libbpf_android/Android.bp
index 93dc7c1..cf443da 100644
--- a/libbpf_android/Android.bp
+++ b/libbpf_android/Android.bp
@@ -26,6 +26,8 @@
         },
     },
     sdk_version: "30",
+    header_libs: ["bpf_syscall_wrappers"],
+    export_header_lib_headers: ["bpf_syscall_wrappers"],
 }
 
 cc_library {