[POWERPC] powermac: Suspend to disk on G5

Powermac G5 suspend to disk implementation.  The code is platform
agnostic but only tested on powermac, no other 64-bit powerpc
machines.

Because nvidiafb still breaks suspend I have marked it EXPERIMENTAL on
powermac and because I can't test it and some lowlevel code will need
changes it is BROKEN on all other 64-bit platforms.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a8e08f4..49b1ea2 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -126,6 +126,11 @@
 	  Used to allow a board to specify it wants a uImage built by default
 	default n
 
+config PPC64_SWSUSP
+	bool
+	depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
+	default y
+
 menu "Processor support"
 choice
 	prompt "Processor Type"