ppc4xx: Add support for ICON board (PPC440SPe)

This patch adds support for the Mosaix Technologies, Inc. ICON board,
based on the AppliedMicro (AMCC) PPC440SPe. It's equipped with an SODIMM
(512MB standard) and 64MByte of NOR FLASH.

Support for the onboard SM502 will be added later.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index a5d5835..00e06b7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -368,6 +368,7 @@
 	ebony		PPC440GP
 	glacier		PPC460GT
 	haleakala	PPC405EXr
+	icon		PPC440SPe
 	katmai		PPC440SPe
 	kilauea		PPC405EX
 	lwmon5		PPC440EPx