atm: he: use mdelay instead of large udelay constants

ARM cannot handle udelay for more than 2 miliseconds, and
it is rather bad style to block the cpu for 16ms anyway,
so let's use msleep instead.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Cc: linux-atm-general@lists.sourceforge.net
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/atm/he.c

@@ -1055,7 +1055,7 @@ static int he_start(struct atm_dev *dev)
 	he_writel(he_dev, 0x0, RESET_CNTL);
 	he_writel(he_dev, 0xff, RESET_CNTL);
 
-	udelay(16*1000);	/* 16 ms */
+	msleep(16);	/* 16 ms */
 	status = he_readl(he_dev, RESET_CNTL);
 	if ((status & BOARD_RST_STATUS) == 0) {
 		hprintk("reset failed\n");