MAINTAINERS: Add Pete Johanson as hal_adi collaborator

Adding Pete Johanson (ADI TSC member) to the collaborators for the hal_adi.

Signed-off-by: Pete Johanson <[email protected]>

Author: petejohanson-adi

MAINTAINERS.yml

@@ -5255,6 +5255,7 @@ West:
     - ozersa
     - ttmut
     - yasinustunerg
+    - petejohanson-adi
   files: []
   labels:
     - "platform: ADI"