ppc4xx: Generic architecture for xilinx ppc405(v3)

As "ppc44x: Unification of virtex5 pp440 boards" did for the xilinx
ppc440 boards, this patch presents a common architecture for all the
xilinx ppc405 boards.

Any custom xilinx ppc405 board can be added very easily with no code
duplicity.

This patch also adds a simple generic board, that can be used on almost
any design with xilinx ppc405 replacing the file ppc405-generic/xparameters.h

This patch is prepared to work with the latest version of EDK (10.1)

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@uam.es>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 60cb6a6..a5d1038 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -320,6 +320,7 @@
 	ml507 		PPC440x5
 	v5fx30teval	PPC440x5
 	xilinx-pp440-generic	PPC440x5
+	xilinx-pp405-generic	PPC405
 
 Stefan Roese <sr@denx.de>