board: gw_ventana: gsc: fix GSC read/write functions

commit 7c84319a ("dm: gpio: Correct use of -ENODEV in drivers")
changed the return code for an I2C NAK from -ENODEV to -EREMOTEIO.

Update the gsc_i2c_read and gsc_i2c_write functions for this change
to properly retry the transaction on a NAK meaning the GSC is busy.

Fixes: 7c84319a ("dm: gpio: Correct use of -ENODEV in drivers")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>

board/gateworks/gw_ventana/gsc.c

@@ -41,7 +41,7 @@ int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
 			break;
 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
 		      n, ret);
-		if (ret != -ENODEV)
+		if (ret != -EREMOTEIO)
 			break;
 		mdelay(10);
 	}
@@ -60,7 +60,7 @@ int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
 			break;
 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
 		      n, ret);
-		if (ret != -ENODEV)
+		if (ret != -EREMOTEIO)
 			break;
 		mdelay(10);
 	}