misc: Added 'fastmodel' to MAINTAINERS

Gabe Black added as the maintainer.

Change-Id: I69273d090bf17da4e54f50340a33a589fdc63c51
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23963
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6b9b453..6ee1e93 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -62,6 +62,9 @@
 
 ext: Components external to gem5
 
+fastmodel: Changes relating to ARM Fast Models
+  Gabe Black <gabeblack@google.com>
+
 gpu-compute:
   Tony Gutierrez <anthony.gutierrez@amd.com>