[ppc4xx] Add initial lwmon5 board support

This patch adds initial support for the Liebherr lwmon5 board euqipped
with an AMCC 440EPx PowerPC.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2eaef17..693b115 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -282,6 +282,7 @@
 	bunbinga		PPC405EP
 	ebony			PPC440GP
 	katmai			PPC440SPe
+	lwmon5			PPC440EPx
 	ocotea			PPC440GX
 	p3p440			PPC440GP
 	pcs440ep		PPC440EP