doc: releases: 3.0: add TF-M release notes

Mention update to TF-M 1.5.0 in Zephyr 3.0.

Signed-off-by: Kevin Townsend <[email protected]>

Author: microbuilder

doc/releases/release-notes-3.0.rst

@@ -558,6 +558,8 @@ MCUboot
 Trusted Firmware-m
 ******************
 
+* Updated TF-M to 1.5.0 release, with a handful of additional cherry-picked
+  commits.
 
 Documentation
 *************