MAINTAINERS: add tomi-font as TF-M maintainer

Upgrade from collaborator to maintainer as suggested in
#99161 (comment).

Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>

Author: tomi-font

MAINTAINERS.yml

@@ -6074,11 +6074,11 @@ West:
   status: maintained
   maintainers:
     - d3zd3z
+    - tomi-font
   collaborators:
     - Vge0rge
     - wearyzen
     - valeriosetti
-    - tomi-font
     - ithinuel
   files: []
   labels:
@@ -6097,11 +6097,11 @@ West:
   status: maintained
   maintainers:
     - d3zd3z
+    - tomi-font
   collaborators:
     - Vge0rge
     - wearyzen
     - valeriosetti
-    - tomi-font
     - ithinuel
   files: []
   labels:
@@ -6147,11 +6147,11 @@ West:
   status: maintained
   maintainers:
     - d3zd3z
+    - tomi-font
   collaborators:
     - Vge0rge
     - wearyzen
     - valeriosetti
-    - tomi-font
     - ithinuel
   files:
     - modules/trusted-firmware-m/