CODEOWNERS: add self as code owner of sound and gpu crate

Add myself to CODEOWNERS to contribute to the reviewing and merging
process of PRs related to vhost-device-sound and vhost-device-gpu
crate.

Signed-off-by: Dorinda Bassey <[email protected]>

Author: Dorinda Bassey

CODEOWNERS

@@ -1,3 +1,5 @@
 # Add the list of code owners here (using their GitHub username)
 * @stsquad @vireshk @stefano-garzarella @epilys
+/vhost-device-gpu/ @dorindabassey
 /vhost-device-scmi/ @mz-pdm
+/vhost-device-sound/ @dorindabassey