mtd: rawnand: fsmc: Add an SPDX tag to replace the license text

Add an SPDX GPL-2.0 tag and update MODULE_LICENSE() to match the
license text.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
1 file changed