ARM: imx: rename mxc_uart_devicex to follow a common naming scheme

Addionally remove an unneeded include.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-imx/devices.h b/arch/arm/mach-imx/devices.h
index 84ed513..65c4a43 100644
--- a/arch/arm/mach-imx/devices.h
+++ b/arch/arm/mach-imx/devices.h
@@ -6,12 +6,14 @@
 extern struct platform_device mxc_gpt5;
 #endif
 extern struct platform_device mxc_wdt;
-extern struct platform_device mxc_uart_device0;
-extern struct platform_device mxc_uart_device1;
-extern struct platform_device mxc_uart_device2;
-extern struct platform_device mxc_uart_device3;
-extern struct platform_device mxc_uart_device4;
-extern struct platform_device mxc_uart_device5;
+extern struct platform_device imx2x_uart_device0;
+extern struct platform_device imx2x_uart_device1;
+extern struct platform_device imx2x_uart_device2;
+extern struct platform_device imx2x_uart_device3;
+#ifdef CONFIG_MACH_MX27
+extern struct platform_device imx2x_uart_device4;
+extern struct platform_device imx2x_uart_device5;
+#endif
 extern struct platform_device mxc_w1_master_device;
 #ifdef CONFIG_MACH_MX21
 extern struct platform_device imx21_nand_device;