nvmem: imx-iim: Convert to use devm_nvmem_register()

Drop all of the code related to .remove hook and make use of
devm_nvmem_register() instead.

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: cphealy@gmail.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/imx-iim.c

@@ -138,25 +138,13 @@ static int imx_iim_probe(struct platform_device *pdev)
 	cfg.size = drvdata->nregs;
 	cfg.priv = iim;
 
-	nvmem = nvmem_register(&cfg);
-	if (IS_ERR(nvmem))
-		return PTR_ERR(nvmem);
+	nvmem = devm_nvmem_register(dev, &cfg);
 
-	platform_set_drvdata(pdev, nvmem);
-
-	return 0;
-}
-
-static int imx_iim_remove(struct platform_device *pdev)
-{
-	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
-
-	return nvmem_unregister(nvmem);
+	return PTR_ERR_OR_ZERO(nvmem);
 }
 
 static struct platform_driver imx_iim_driver = {
 	.probe	= imx_iim_probe,
-	.remove	= imx_iim_remove,
 	.driver = {
 		.name	= "imx-iim",
 		.of_match_table = imx_iim_dt_ids,