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/arch/powerpc/include/asm/ppc405ez.h b/arch/powerpc/include/asm/ppc405ez.h
index 9192c62..cb8e994 100644
--- a/arch/powerpc/include/asm/ppc405ez.h
+++ b/arch/powerpc/include/asm/ppc405ez.h
@@ -24,8 +24,13 @@
 #define CONFIG_NAND_NDFC
 
 /* Memory mapped register */
-#define GPIO0_BASE	0xef600700
-#define GPIO1_BASE	0xef600800
+#define CONFIG_SYS_PERIPHERAL_BASE	0xef600000 /* Internal Peripherals */
+
+#define CONFIG_SYS_NS16550_COM1	(CONFIG_SYS_PERIPHERAL_BASE + 0x0300)
+#define CONFIG_SYS_NS16550_COM2	(CONFIG_SYS_PERIPHERAL_BASE + 0x0400)
+
+#define GPIO0_BASE		(CONFIG_SYS_PERIPHERAL_BASE + 0x0700)
+#define GPIO1_BASE		(CONFIG_SYS_PERIPHERAL_BASE + 0x0800)
 
 /* DCR register */
 #define OCM0_PLBCR1	0x0020	/* OCM PLB3 Bank 1 Config */