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/XPEDITE1000.h b/include/configs/XPEDITE1000.h
index cf39aea..f76ede3 100644
--- a/include/configs/XPEDITE1000.h
+++ b/include/configs/XPEDITE1000.h
@@ -54,7 +54,6 @@
 #define CONFIG_SYS_FLASH_BASE		0xff000000	/* start of FLASH */
 #define CONFIG_SYS_MONITOR_BASE		TEXT_BASE	/* start of monitor */
 #define CONFIG_SYS_PCI_MEMBASE		0x80000000	/* mapped pci memory */
-#define CONFIG_SYS_PERIPHERAL_BASE	0xe0000000	/* internal peripherals */
 #define CONFIG_SYS_ISRAM_BASE		0xc0000000	/* internal SRAM */
 #define CONFIG_SYS_PCI_BASE		0xd0000000	/* internal PCI regs */
 #define CONFIG_SYS_NVRAM_BASE_ADDR	(CONFIG_SYS_PERIPHERAL_BASE + 0x08000000)
@@ -112,6 +111,12 @@
 /*
  * 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()
+
 #define CONFIG_SYS_BAUDRATE_TABLE \
 	{300, 600, 1200, 2400, 4800, 9600, 19200, 38400}
 #define CONFIG_BAUDRATE			115200