doc/release: Add release note on removal of fa_device_id
Note on removal of fa_device_id from flash_area structure.
@@ -660,6 +660,13 @@ HALs
MCUboot
*******
+Storage
+*******
+
+* Flash Map API drops ``fa_device_id`` from :c:struct:`flash_area`, as it
+ is no longer needed by MCUboot, and has not been populated for a long
+ time now.
+
Trusted Firmware-M
******************
