Merge and reformat boards.cfg and MAINTAINERS

Put all informations about targets, including state (active or
orphan) and maintainers, in boards.cfg; remove MAINTAINERS;
adjust the build system accordingly.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/Makefile b/Makefile
index d8637b6..1365db6 100644
--- a/Makefile
+++ b/Makefile
@@ -838,7 +838,7 @@
 
 sinclude $(obj).boards.depend
 $(obj).boards.depend:	boards.cfg
-	@awk '(NF && $$1 !~ /^#/) { print $$1 ": " $$1 "_config; $$(MAKE)" }' $< > $@
+	@awk '(NF && $$1 !~ /^#/) { print $$7 ": " $$7 "_config; $$(MAKE) -d" }' $< > $@
 
 #
 # Functions to generate common board directory names