ppc4xx: Use common NS16550 driver for PPC4xx UART

This patch removes the PPC4xx UART driver. Instead the common NS16550
driver is used, since all PPC4xx SoC's use this peripheral device.

The file 4xx_uart.c now only implements the UART clock calculation
function which also sets the SoC internal UART divisors.

All PPC4xx board config headers are changed to use this common NS16550
driver now.

Tested on these boards:
acadia, canyonlands, katmai, kilauea, sequoia, zeus

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/DU440.h b/include/configs/DU440.h
index 830466f..9c34994 100644
--- a/include/configs/DU440.h
+++ b/include/configs/DU440.h
@@ -64,9 +64,6 @@
 #define CONFIG_SYS_PCI_SUBSYS_VENDORID	PCI_VENDOR_ID_ESDGMBH
 #define CONFIG_SYS_PCI_SUBSYS_ID	0x0444		/* device ID for DU440 */
 
-/* Don't change either of these */
-#define CONFIG_SYS_PERIPHERAL_BASE	0xef600000	/* internal peripherals	*/
-
 #define CONFIG_SYS_USB2D0_BASE		0xe0000100
 #define CONFIG_SYS_USB_DEVICE		0xe0000000
 #define CONFIG_SYS_USB_HOST		0xe0000400
@@ -86,10 +83,14 @@
 /*
  * Serial Port
  */
+#define CONFIG_CONS_INDEX	1	/* Use UART0			*/
+#define CONFIG_SYS_NS16550
+#define CONFIG_SYS_NS16550_SERIAL
+#define CONFIG_SYS_NS16550_REG_SIZE	1
+#define CONFIG_SYS_NS16550_CLK		get_serial_clock()
 #undef CONFIG_SYS_EXT_SERIAL_CLOCK
 #define CONFIG_BAUDRATE		115200
 #define CONFIG_SERIAL_MULTI     1
-#undef CONFIG_UART1_CONSOLE
 
 #define CONFIG_SYS_BAUDRATE_TABLE						\
 	{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200}