misc: Add Giacomo Travaglini as an Arm maintainer
misc: Add Giacomo Travaglini as an Arm maintainer

I have been delegating a lot of changes to Giacomo T for a long time,
making him a de facto Arm co-maintainer. Make this official by adding
him to the list of maintainers.

Change-Id: I69c53316e2fc6ca162d07ac2d167ac2ae2b6bbee
Signed-off-by: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21899
Maintainer: Jason Lowe-Power <68c46a606457643eab92053c1c05574abb26f861@lowepower.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jason Lowe-Power <68c46a606457643eab92053c1c05574abb26f861@lowepower.com>

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