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/MAINTAINERS b/MAINTAINERS
index 2cf29dd..e235884 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -501,6 +501,10 @@
 
 	inka4x0		MPC5200
 
+Tirumala Marri <tmarri@apm.com>
+
+	bluestone       APM821XX
+
 -------------------------------------------------------------------------
 
 Unknown / orphaned boards: