doc: release-notes-4.0: add release notes for firmware subsystem

LaurentiuM1234 · mmahadevan108 · commit c0a0e6a3887c · 2024-11-13T21:14:05.000-06:00
Includes notes on SCMI's introduction.

Signed-off-by: Laurentiu Mihalcea &lt;laurentiu.mihalcea@nxp.com&gt;
diff --git a/doc/releases/release-notes-4.0.rst b/doc/releases/release-notes-4.0.rst
@@ -1209,6 +1209,14 @@ Libraries / Subsystems
 
     (:github:`79653`)
 
+* Firmware
+
+  * Introduced basic support for ARM's System Control and Management Interface, which includes:
+
+    * Subset of clock management protocol commands
+    * Subset of pin control protocol commands
+    * Shared memory and mailbox-based transport
+
 HALs
 ****
 
