hwmon: (adm1029) Add SPDX header

This patch addes SPDX header to adm1029
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/adm1029.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
  *