Update copyright years

Scripted copyright year updates based on git committer date.
diff --git a/string/arm/memchr.S b/string/arm/memchr.S
index 9b77b75..823d601 100644
--- a/string/arm/memchr.S
+++ b/string/arm/memchr.S
@@ -1,7 +1,7 @@
 /*
  * memchr - scan memory for a character
  *
- * Copyright (c) 2010-2021, Arm Limited.
+ * Copyright (c) 2010-2022, Arm Limited.
  * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
  */