hwmon: axi-fan: don't use driver_override as IRQ name

hwmon: axi-fan: don't use driver_override as IRQ name

Do not use driver_override as IRQ name, as it is not guaranteed to point
to a valid string; use NULL instead (which makes the devm IRQ helpers
use dev_name()).

Fixes: 8412b410fa5e ("hwmon: Support ADI Fan Control IP")
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patch.msgid.link/20260303115720.48783-4-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>