governance: add Renato Arantes as onednn-cpu-aarch64 codeowner

Signed-off-by: Siddhartha Menon <siddhartha.menon@arm.com>

Author: Sqvid

MAINTAINERS.md

@@ -165,6 +165,7 @@ Team: @uxlfoundation/onednn-cpu-aarch64
 | Siddhartha Menon   | @Sqvid                | Arm Ltd           | Code Owner |
 | Sunita Nadampalli  | @snadampal            | Amazon.com, Inc.  | Code Owner |
 | Ryo Suzuki         | @Ryo-not-rio          | Arm Ltd           | Code Owner |
+| Renato Arantes     | @renato-arantes       | Arm Ltd           | Code Owner |
 
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