docs(changelog): add some architecture features

Add missing scopes for FEAT_SCTLR2, FEAT_D128 and FEAT_THE.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I32b0dd2bdf68a5a56f8b236155ad44686d853eca
diff --git a/changelog.yaml b/changelog.yaml
index 49938da..f2403d0 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -161,6 +161,18 @@
       - title: DynamIQ Shared Unit (DSU)
         scope: dsu
 
+      - title: Extension to SCTLR_ELx (FEAT_SCTLR2)
+        scope: sctlr2
+
+        deprecated:
+          - feat_sctlr2
+
+      - title: 128-bit Translation Tables (FEAT_D128)
+        scope: d128
+
+      - title: Translation Hardening Extension (FEAT_THE)
+        scope: the
+
   - title: Platforms
     scope: platforms