Determine the IRQ number in the same way as for pnv_dt_ipmi_bt(). This
resolves one usage of ISADevice::isairq[] which allows it to be removed
eventually.
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220301220037.76555-6-shentey@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>