misc: Add Matt Poremba as GPU maintainer

Change-Id: I90494955b6db628695ef8a42111977decba27618
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34655
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Matthew Poremba <matthew.poremba@amd.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 92c4ce8..d248ec1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -68,6 +68,7 @@
 
 gpu-compute:
   Tony Gutierrez <anthony.gutierrez@amd.com>
+  Matt Poremba <matthew.poremba@amd.com>
 
 learning-gem5: The code and configs for the Learning gem5 book (see
                learning.gem5.com)