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/README b/README
index 0833c41..27a075a 100644
--- a/README
+++ b/README
@@ -608,10 +608,6 @@
 		 * Adds the "fdt" command
 		 * The bootm command automatically updates the fdt
 
-		OF_CPU - The proper name of the cpus node (only required for
-			MPC512X and MPC5xxx based boards).
-		OF_SOC - The proper name of the soc node (only required for
-			MPC512X and MPC5xxx based boards).
 		OF_TBCLK - The timebase frequency.
 		OF_STDOUT_PATH - The path to the console device
 
@@ -1232,7 +1228,7 @@
 
 - USB Support:
 		At the moment only the UHCI host controller is
-		supported (PIP405, MIP405, MPC5200); define
+		supported (PIP405, MIP405); define
 		CONFIG_USB_UHCI to enable it.
 		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
 		and define CONFIG_USB_STORAGE to enable the USB
@@ -1240,19 +1236,6 @@
 		Note:
 		Supported are USB Keyboards and USB Floppy drives
 		(TEAC FD-05PUB).
-		MPC5200 USB requires additional defines:
-			CONFIG_USB_CLOCK
-				for 528 MHz Clock: 0x0001bbbb
-			CONFIG_PSC3_USB
-				for USB on PSC3
-			CONFIG_USB_CONFIG
-				for differential drivers: 0x00001000
-				for single ended drivers: 0x00005000
-				for differential drivers on PSC3: 0x00000100
-				for single ended drivers on PSC3: 0x00004100
-			CONFIG_SYS_USB_EVENT_POLL
-				May be defined to allow interrupt polling
-				instead of using asynchronous interrupts
 
 		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
 		txfilltuning field in the EHCI controller on reset.
@@ -1894,12 +1877,6 @@
 		In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
 		with a list of GPIO LEDs that have inverted polarity.
 
-- CAN Support:	CONFIG_CAN_DRIVER
-
-		Defining CONFIG_CAN_DRIVER enables CAN driver support
-		on those systems that support this (optional)
-		feature.
-
 - I2C Support:	CONFIG_SYS_I2C
 
 		This enable the NEW i2c subsystem, and will allow you to use