Remove support for the RELEASE_BPF_ENABLE_LIBBPF flag

This flag has already been released, so the code path
for its disabled state can now be removed.

Test: TH
Bug: 359646531
Bug: 410982483
Change-Id: Ia211fe240e6687e00470a9fb9350a2a7ae089580

loader/Android.bp

@@ -104,10 +104,6 @@ cc_test {
 
 rust_binary {
     name: "bpfloader",
-    cfgs: select(release_flag("RELEASE_BPF_ENABLE_LIBBPF"), {
-        true: ["enable_libbpf"],
-        default: [],
-    }),
     srcs: [
         "bpfloader.rs",
     ],
@@ -120,14 +116,9 @@ rust_binary {
         "liblibbpf_rs",
         "liblibc",
     ],
-    required: [] + select(release_flag("RELEASE_BPF_ENABLE_LIBBPF"), {
-        true: [
-            "timeInState.bpf",
-        ],
-        default: [
-            "timeInState.o",
-        ],
-    }),
+    required: [
+        "timeInState.bpf",
+    ],
     product_variables: {
         debuggable: {
             required: [

loader/bpfloader.rs

@@ -16,9 +16,6 @@
 
 //! BPF loader for system and vendor applications
 
-// Enable dead_code until feature flag is removed.
-#![cfg_attr(not(enable_libbpf), allow(dead_code))]
-
 use android_ids::{AID_ROOT, AID_SYSTEM};
 use android_logger::AndroidLogger;
 use anyhow::{anyhow, ensure};
@@ -261,7 +258,6 @@ fn libbpf_worker(file_desc: &BpfFileDesc) -> Result<(), anyhow::Error> {
     Ok(())
 }
 
-#[cfg(enable_libbpf)]
 fn load_libbpf_progs() {
     info!("Loading libbpf programs");
     for file_desc in FILE_ARR {
@@ -275,12 +271,6 @@ fn load_libbpf_progs() {
     }
 }
 
-#[cfg(not(enable_libbpf))]
-fn load_libbpf_progs() {
-    // Empty stub for feature flag disabled case
-    info!("Loading libbpf programs DISABLED");
-}
-
 fn main() {
     let kmsg_fd = env::var("ANDROID_FILE__dev_kmsg").unwrap().parse::<i32>().unwrap();
     // SAFETY: The init script opens this file for us