MX31: add spi controller devices/resources

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx3/devices.h

@@ -20,4 +20,7 @@ extern struct platform_device mxc_otg_host;
 extern struct platform_device mxc_usbh1;
 extern struct platform_device mxc_usbh2;
 extern struct platform_device mxc_rnga_device;
+extern struct platform_device imx_spi_device0;
+extern struct platform_device imx_spi_device1;
+extern struct platform_device imx_spi_device2;