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/ppmc8260.h b/include/configs/ppmc8260.h
index 7db7498..8ceb9bf 100644
--- a/include/configs/ppmc8260.h
+++ b/include/configs/ppmc8260.h
@@ -34,6 +34,8 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#define	CONFIG_SYS_TEXT_BASE	0xfe000000
+
 /*****************************************************************************
  *
  * These settings must match the way _your_ board is set up