spi: mxc: Fix compilation problem of DM_SPI class driver

drivers/spi/mxc_spi.c:507: undefined reference to `dev_get_addr'
linux-ld.bfd: BFD (GNU Binutils) 2.29.1 assertion fail elf32-arm.c:9509

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

drivers/spi/mxc_spi.c

@@ -504,7 +504,7 @@ static int mxc_spi_probe(struct udevice *bus)
 		return -EINVAL;
 	}
 
-	plat->base = dev_get_addr(bus);
+	plat->base = devfdt_get_addr(bus);
 	if (plat->base == FDT_ADDR_T_NONE)
 		return -ENODEV;