Revert "init: adding fallback paths for debug ramdisk"

This reverts commit 6cb4311f4dd2498755d4446aa0f9ade4b69bc9b5.

Reason for revert: no need to keep the compatibility now

Bug: 186485355
Change-Id: Iffdf3abebc17f32e36f3b3fe2b4f9c2592da9653
Test: TreeHugger
diff --git a/init/first_stage_init.cpp b/init/first_stage_init.cpp
index 84cda98..78e5b60 100644
--- a/init/first_stage_init.cpp
+++ b/init/first_stage_init.cpp
@@ -329,23 +329,10 @@
 
     // If "/force_debuggable" is present, the second-stage init will use a userdebug
     // sepolicy and load adb_debug.prop to allow adb root, if the device is unlocked.
-    bool found_debuggable = false;
-    std::string adb_debug_prop("/adb_debug.prop");
-    std::string userdebug_sepolicy("/userdebug_plat_sepolicy.cil");
     if (access("/force_debuggable", F_OK) == 0) {
-        found_debuggable = true;
-    } else if (access("/first_stage_ramdisk/force_debuggable", F_OK) == 0) {
-        // Fallback to legacy debug resource paths.
-        // TODO(b/186485355): removes the fallback path once it is not needed.
-        found_debuggable = true;
-        adb_debug_prop.insert(0, "/first_stage_ramdisk");
-        userdebug_sepolicy.insert(0, "/first_stage_ramdisk");
-    }
-
-    if (found_debuggable) {
         std::error_code ec;  // to invoke the overloaded copy_file() that won't throw.
-        if (!fs::copy_file(adb_debug_prop, kDebugRamdiskProp, ec) ||
-            !fs::copy_file(userdebug_sepolicy, kDebugRamdiskSEPolicy, ec)) {
+        if (!fs::copy_file("/adb_debug.prop", kDebugRamdiskProp, ec) ||
+            !fs::copy_file("/userdebug_plat_sepolicy.cil", kDebugRamdiskSEPolicy, ec)) {
             LOG(ERROR) << "Failed to setup debug ramdisk";
         } else {
             // setenv for second-stage init to read above kDebugRamdisk* files.