APM821xx: Add bluestone board support

Add support code for bluestone board wth APM821XX processor based.
This patch includes early board init, misc init, configure EBC,
initializes UIC, MAKEALL, board.cfg and MAINTAINERS file.

Signed-off-by: Tirumala R Marri <tmarri@apm.com
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/boards.cfg b/boards.cfg
index f55bd70..d5d4445 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -184,6 +184,7 @@
 zeus		powerpc	ppc4xx
 acadia		powerpc	ppc4xx		-		amcc
 bamboo		powerpc	ppc4xx		-		amcc
+bluestone	powerpc ppc4xx		-		amcc
 bubinga		powerpc	ppc4xx		-		amcc
 ebony		powerpc	ppc4xx		-		amcc
 katmai		powerpc	ppc4xx		-		amcc