Use bpf_target property for bpf

Bug: b/308826679

Change-Id: I6c433ec837b60850f378697c131cc2d3352c536f
diff --git a/libbpf-tools/Android.bp b/libbpf-tools/Android.bp
index d7602bc..e24b2c0 100644
--- a/libbpf-tools/Android.bp
+++ b/libbpf-tools/Android.bp
@@ -28,7 +28,6 @@
     name: "bcc_bpf_defaults",
     compile_multilib: "first",
     cflags: [
-        "--target=bpf",
         "-fno-data-sections",
         "-fno-function-sections",
         "-fno-stack-protector",
@@ -70,6 +69,7 @@
             ],
         },
     },
+    bpf_target: true,
     visibility: ["//visibility:private"],
 }