Add ChangeLog entry

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/ChangeLog.d/remove-via-padlock-support.txt b/ChangeLog.d/remove-via-padlock-support.txt
new file mode 100644
index 0000000..7d259de
--- /dev/null
+++ b/ChangeLog.d/remove-via-padlock-support.txt
@@ -0,0 +1,5 @@
+Removals
+   * Drop support for VIA Padlock. Removes MBEDTLS_PADLOCK_C and
+   * associated code.
+   * Note that it is still possible to use VIA Padlock through a
+   * PSA accelerator driver that is not part of Mbed TLS. Fixes #5903.
\ No newline at end of file