feat(tcr2): add FEAT_TCR2 to the changelog

This was omitted from the patch adding the feature.

Signed-off-by: Mark Brown <broonie@kernel.org>
Change-Id: Ie7f2b63434a70320178be74fc3f165618aca8392
diff --git a/changelog.yaml b/changelog.yaml
index 2f51ce0..925d447 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -101,6 +101,9 @@
       - title: Extended Cache Index (FEAT_CCIDX)
         scope: ccidx
 
+      - title: Extended Translation Control Register (FEAT_TCR2).
+        scope: tcr2
+
       - title: CPU feature / ID register handling in general
         scope: cpufeat