Added a changelog entry for the removal

Signed-off-by: Anton Matkin <anton.matkin@arm.com>
diff --git a/ChangeLog.d/10285.txt b/ChangeLog.d/10285.txt
new file mode 100644
index 0000000..dae7e33
--- /dev/null
+++ b/ChangeLog.d/10285.txt
@@ -0,0 +1,3 @@
+Removals
+   * Removed the programs/pkey directory. These will be moved to the
+     TF-PSA-Crypto repository later.
\ No newline at end of file