rtc: wm831x: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-03-22 08:16:11 +01:00
commit e07fa839d9