nvmem: imx-ocotp: Fix assignment warning.

This patch fixes below error if the driver is compiled with 64 bit
machine configuration.

"drivers/nvmem/imx-ocotp.c:102:14: warning: assignment makes integer
from pointer without a cast"
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/imx-ocotp.c

@@ -99,7 +99,7 @@ static int imx_ocotp_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->clk);
 
 	of_id = of_match_device(imx_ocotp_dt_ids, dev);
-	priv->nregs = (unsigned int)of_id->data;
+	priv->nregs = (unsigned long)of_id->data;
 	imx_ocotp_nvmem_config.size = 4 * priv->nregs;
 	imx_ocotp_nvmem_config.dev = dev;
 	imx_ocotp_nvmem_config.priv = priv;