Add support for Korat PPC440EPx board

These patches add support for the PPC440EPx-based "Korat" board to
U-Boot.  They are based primarily on support for the Sequoia board.

Signed-off-by: Larry Johnson <lrj@acm.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index bf0ebb1..0238d2e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -204,6 +204,10 @@
 	cogent_mpc8260		MPC8260
 	hymod			MPC8260
 
+Larry Johnson <lrj@acm.org>
+
+	korat			PPC440EPx
+
 Brad Kemp <Brad.Kemp@seranoa.com>
 
 	ppmc8260		MPC8260