powerpc, 5xxx, 512x: remove support for mpc5xxx and mpc512x

There was for long time no activity in the mpx5xxx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in mpc5xxx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/serial.h b/include/serial.h
index 47332c5..a37ea18 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -29,9 +29,8 @@
 #if	defined(CONFIG_405GP) || \
 	defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
 	defined(CONFIG_405EX) || defined(CONFIG_440) || \
-	defined(CONFIG_MPC5xxx) || \
 	defined(CONFIG_MPC83xx) || defined(CONFIG_MPC85xx) || \
-	defined(CONFIG_MPC86xx) || defined(CONFIG_SYS_SC520) || \
+	defined(CONFIG_MPC86xx) || \
 	defined(CONFIG_TEGRA) || defined(CONFIG_SYS_COREBOOT) || \
 	defined(CONFIG_MICROBLAZE)
 extern struct serial_device serial0_device;
@@ -69,13 +68,6 @@
 
 #endif /* CONFIG_USB_TTY */
 
-#if defined(CONFIG_MPC512X)
-extern struct stdio_dev *open_port(int num, int baudrate);
-extern int close_port(int num);
-extern int write_port(struct stdio_dev *port, char *buf);
-extern int read_port(struct stdio_dev *port, char *buf, int size);
-#endif
-
 struct udevice;
 
 /**
@@ -192,7 +184,6 @@
 void max3100_serial_initialize(void);
 void mcf_serial_initialize(void);
 void ml2_serial_initialize(void);
-void mpc512x_serial_initialize(void);
 void mpc5xx_serial_initialize(void);
 void mpc8260_scc_serial_initialize(void);
 void mpc8260_smc_serial_initialize(void);