feat(lfa): create LFA SMC handler template

As per the specification v1.0[1], added all Live Firmware Activation
(LFA) SMCs, including their Function IDs (FIDs) and associated error
codes.
A dummy handler function has been created as a template. Subsequent
patches will implement the handling of these SMCs.

[1]: https://developer.arm.com/documentation/den0147/latest/

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I5d6500dcff35aa4a438cd5f97f349cd57406ddce
diff --git a/changelog.yaml b/changelog.yaml
index 5a8ca1e..e0a4f42 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -775,6 +775,9 @@
       - title: ChromeOS
         scope: cros
 
+      - title: Live Firmware Activation
+        scope: lfa
+
       - title: Secure Payload Dispatcher
         scope: spd