powerpc/85xx: Add power management support for MPC85xxMDS boards

- Add power management controller nodes;
- Add interrupts for RTC nodes, the RTC interrupt may be used as a
  wakeup source;
- Add sleep properties (DEVDISR bit mask) and sleep-nexus nodes.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
index 3909d57..c5028a2 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
@@ -301,6 +301,7 @@
 	{ .compatible = "fsl,qe", },
 	{ .compatible = "gianfar", },
 	{ .compatible = "fsl,rapidio-delta", },
+	{ .compatible = "fsl,mpc8548-guts", },
 	{},
 };