[POWERPC] Add arch/powerpc support for the Motorola PrPMC2800

This finally adds the PPC_PRPMC2800 Kconfig option, the board setup
code (the setup and reset functions) and the defconfig, to support the
Motorola PrPMC2800 platform.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -454,7 +454,7 @@ config ARCH_ENABLE_MEMORY_HOTPLUG
 
 config KEXEC
 	bool "kexec system call (EXPERIMENTAL)"
-	depends on PPC_MULTIPLATFORM && EXPERIMENTAL
+	depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 	help
 	  kexec is a system call that implements the ability to shutdown your
 	  current kernel, and to start another kernel.  It is like a reboot