spi: fsl-lpspi: Fix problematic dev_set_drvdata call

The original code already set controller as drvdata:
platform_set_drvdata(pdev, controller);

But commit 944c01a8 ("spi: lpspi: enable runtime pm for lpspi")
added dev_set_drvdata(&pdev->dev, fsl_lpspi);
so fsl_lpspi_remove() will get wrong pointer by platform_get_drvdata().

Fixes: 944c01a8

 ("spi: lpspi: enable runtime pm for lpspi")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>