compat: Provide shim with IPermissionController stubs

* All the IPermissionController related functions are guarded by
  `if !defined(__ANDROID_VNDK__)` [1], meaning they're not fully
  accessible to vendors.

* Since we know these are mainly used to check whether an app or
  process has a required permission, simply provide an stub that
  returns true no matter what the permission / caller are.

- [1]: https://github.com/LineageOS/android_frameworks_native/blob/lineage-20.0/libs/binder/IServiceManager.cpp#L170

Change-Id: I898bf8eb577faecb8bc0f007498b835816dddb93

Android.bp

@@ -252,6 +252,16 @@ cc_library {
     vendor: true
 }
 
+cc_library {
+    name: "libbinder_shim",
+    shared_libs: ["libbinder", "libutils"],
+    srcs: [
+        "libbinder/IServiceManager.cpp",
+        "libbinder/PermissionCache.cpp",
+    ],
+    vendor: true
+}
+
 cc_library {
     name: "libcamera_metadata_shim",
     shared_libs: ["libcamera_metadata"],

libbinder/IServiceManager.cpp

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2023 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <utils/String16.h>
+
+namespace android {
+
+bool checkCallingPermission(const String16& /* permission */) {
+    return true;
+};
+
+}  // namespace android

libbinder/PermissionCache.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2023 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <utils/String16.h>
+
+namespace android {
+namespace PermissionCache {
+
+bool checkPermission(const String16& /* permission */, pid_t /* pid */, uid_t /* uid */) {
+    return true;
+};
+
+bool checkCallingPermission(const String16& /* permission */) {
+    return true;
+};
+
+}  // namespace PermissionCache
+}  // namespace android