binder: Add copyright notice to new kunit files

Clean up for the binder_alloc kunit test series. Add a copyright notice
to new files, as suggested by Carlos [1].

[1] https://lore.kernel.org/all/CAFuZdDLD=3CBOLSWw3VxCf7Nkf884SSNmt1wresQgxgBwED=eQ@mail.gmail.com/

Fixes: 5e024582f4 ("binder: Scaffolding for binder_alloc KUnit tests")
Suggested-by: Carlos Llamas <cmllamas@google.com>
Cc: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Tiffany Yang <ynaffit@google.com>
Link: https://lore.kernel.org/r/20250722234508.232228-1-ynaffit@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/android/tests/.kunitconfig

@@ -1,3 +1,7 @@
+#
+# Copyright 2025 Google LLC.
+#
+
 CONFIG_KUNIT=y
 CONFIG_ANDROID_BINDER_IPC=y
 CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST=y

drivers/android/tests/Makefile

@@ -1,3 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright 2025 Google LLC.
+#
 
 obj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST)	+= binder_alloc_kunit.o

drivers/android/tests/binder_alloc_kunit.c

@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Test cases for binder allocator code
+ * Test cases for binder allocator code.
+ *
+ * Copyright 2025 Google LLC.
+ * Author: Tiffany Yang <ynaffit@google.com>
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt