docs(changelog): add scope for MbedTLS PSA Crypto

Added scope for MbedTLS PSA Crypto API implementation.

Change-Id: I0a7c6242841dfb94f6ca5e9174ffd520c5fe00fa
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/changelog.yaml b/changelog.yaml
index 3f7979e..2d6986b 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -809,6 +809,9 @@
           - title: mbedTLS
             scope: mbedtls
 
+          - title: mbedTLS-PSA
+            scope: mbedtls-psa
+
       - title: Console
         scope: console