Add a changelog entry regarding bugfixes

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/ChangeLog.d/psa_crypto_reduced_configs_bugs.txt b/ChangeLog.d/psa_crypto_reduced_configs_bugs.txt
new file mode 100644
index 0000000..0d61cb7
--- /dev/null
+++ b/ChangeLog.d/psa_crypto_reduced_configs_bugs.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix several bugs (warnings, compiler and linker errors, test failures)
+     in reduced configurations when MBEDTLS_USE_PSA_CRYPTO is enabled.