ulib: Use the correct copyright message

Canonical should be written with the 'Ltd.' suffix, so add this to a few
files that need it.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/u-boot-lib.lds

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * Copyright 2025 Canonical
+ * Copyright 2025 Canonical Ltd.
  * Written by Simon Glass <simon.glass@canonical.com>
  *
  * Linker script for U-Boot shared library (libu-boot.so)

examples/ulib/Makefile

@@ -2,7 +2,7 @@
 #
 # Standalone Makefile for U-Boot library examples
 #
-# Copyright 2025 Canonical
+# Copyright 2025 Canonical Ltd.
 # Written by Simon Glass <simon.glass@canonical.com>
 
 # This Makefile can be used to build the examples. See doc/develop/ulib.rst

examples/ulib/demo.c

@@ -5,7 +5,7 @@
  * This demonstrates using U-Boot library functions in sandbox like os_*
  * from external programs.
  *
- * Copyright 2025 Canonical
+ * Copyright 2025 Canonical Ltd.
  * Written by Simon Glass <simon.glass@canonical.com>
  */
 

include/u-boot-lib.h

@@ -6,7 +6,7 @@
  *
  * Library functions must be individually accessed via their respective headers.
  *
- * Copyright 2025 Canonical
+ * Copyright 2025 Canonical Ltd.
  * Written by Simon Glass <simon.glass@canonical.com>
  */
 

lib/ulib/Makefile

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 
-# Copyright 2025 Canonical
+# Copyright 2025 Canonical Ltd.
 # Written by Simon Glass <simon.glass@canonical.com>
 
 obj-y += ulib.o

lib/ulib/ulib.c

@@ -2,7 +2,7 @@
 /*
  * Simplified U-Boot library interface implementation
  *
- * Copyright 2025 Canonical
+ * Copyright 2025 Canonical Ltd.
  * Written by Simon Glass <simon.glass@canonical.com>
  */
 

test/ulib/ulib_test.c

@@ -4,7 +4,7 @@
  *
  * This demonstrates linking against libu-boot.so and libu-boot.a
  *
- * Copyright 2025 Canonical
+ * Copyright 2025 Canonical Ltd.
  * Written by Simon Glass <simon.glass@canonical.com>
  */