hw/isa: extract FDC37M81X to a separate file

isa-superio.c currently defines a SuperIO chip that is not used
by any other user of the file.  Extract the chip to a separate file.

Reviewed-by: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240213155005.109954-7-pbonzini@redhat.com>
[PMD: Update MAINTAINERS]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
6 files changed