staging: mt7621-eth: fix spelling mistake: "devictree" -> "devicetree"

Trivial fix to spelling mistake in dev_err message text
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-eth/mtk_eth_soc.c

@@ -2096,7 +2096,7 @@ static int mtk_probe(struct platform_device *pdev)
 	sysclk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(sysclk)) {
 		dev_err(&pdev->dev,
-			"the clock is not defined in the devictree\n");
+			"the clock is not defined in the devicetree\n");
 		return -ENXIO;
 	}
 	eth->sysclk = clk_get_rate(sysclk);