thermal: exynos: Read soc_type from match data

Device context's field data->soc is currently obtained by comparing
of_compatible's. Provide soc_type as .data field in device's match
table, as it is done in most drivers.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>