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/include/configs/MPC8323ERDB.h b/include/configs/MPC8323ERDB.h
index f81ca8c..177e6e9 100644
--- a/include/configs/MPC8323ERDB.h
+++ b/include/configs/MPC8323ERDB.h
@@ -17,6 +17,8 @@
 #define CONFIG_MPC83xx		1	/* MPC83xx family */
 #define CONFIG_MPC832x		1	/* MPC832x CPU specific */
 
+#define	CONFIG_SYS_TEXT_BASE	0xFE000000
+
 #define CONFIG_PCI		1
 
 /*