MAINTAINERS: Add collaborators to IAR toolchain area

Add @bjorniuppsala and @LoveKarlsson as collaborators for the
IAR toolchain area.

Signed-off-by: Robin Kastberg <[email protected]>

Author: RobinKastberg

MAINTAINERS.yml

@@ -4590,6 +4590,9 @@ TDK Sensors:
   status: maintained
   maintainers:
     - RobinKastberg
+  collaborators:
+    - bjorniuppsala
+    - LoveKarlsson
   files:
     - cmake/*/iar/
     - include/zephyr/toolchain/iar.h