Makefile: move all Power Architecture boards into boards.cfg

Clean up Makefile, and drop a lot of the config.mk files on the way.

We now also automatically pick all boards that are listed in
boards.cfg (and with all configurations), so we can drop the redundant
entries from MAKEALL to avoid building these twice.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/doc/README.korat b/doc/README.korat
index a753f84..e059f78 100644
--- a/doc/README.korat
+++ b/doc/README.korat
@@ -36,8 +36,8 @@
 
 The build sequence:
 
-	make korat_config
-	make all perm=1
+	make korat_perm_config
+	make all
 
 builds the permanent U-Boot by selecting loader file "u-boot.lds" and defining
 preprocessor symbol "CONFIG_KORAT_PERMANENT".  The default build:
@@ -45,7 +45,7 @@
 	make korat_config
 	make all
 
-creates the upgradable U-Boot but selecting loader file "u-boot-F7FC.lds" and
+creates the upgradable U-Boot by selecting loader file "u-boot-F7FC.lds" and
 leaving preprocessor symbol "CONFIG_KORAT_PERMANENT" undefined.
 
 2008-02-22, Larry Johnson <lrj@acm.org>