mfd: tqmx86: Add support for TQ-Systems DMI IDs

Newer TQMx86 modules use TQ-Systems instead of TQ-Group as their vendor
ID.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Lee Jones <lee.jones@linaro.org>