Added myself as a reviewer of vmgenid, unimplemented device and empty slot.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20220131122001.1476101-1-ani@anisinha.ca
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>