dmaengine: fsl-qdma: add MODULE_LICENSE

The newly added driver lacks a MODULE_LICENSE tag, which now produces
a warning:

WARNING: modpost: missing MODULE_LICENSE() in drivers/dma/fsl-qdma.o

Add the license according to the SPDX specifier.

Fixes: 75628c149b0d ("dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-qdma.c

@@ -1255,4 +1255,5 @@ static struct platform_driver fsl_qdma_driver = {
 module_platform_driver(fsl_qdma_driver);
 
 MODULE_ALIAS("platform:fsl-qdma");
+MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");