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/hcu4.h b/include/configs/hcu4.h
index 394a45f..dd5e5a2 100644
--- a/include/configs/hcu4.h
+++ b/include/configs/hcu4.h
@@ -37,6 +37,8 @@
 #define CONFIG_4xx   1
 #define CONFIG_HOSTNAME		hcu4
 
+#define	CONFIG_SYS_TEXT_BASE	0xFFFB0000
+
 /*
  * Include common defines/options for all boards produced by Netstal Maschinen
  */