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/Sandpoint8245.h b/include/configs/Sandpoint8245.h
index 0381252..525e9fec 100644
--- a/include/configs/Sandpoint8245.h
+++ b/include/configs/Sandpoint8245.h
@@ -39,6 +39,8 @@
 #define CONFIG_MPC8245		1
 #define CONFIG_SANDPOINT	1
 
+#define	CONFIG_SYS_TEXT_BASE	0xFFF00000
+
 #if 0
 #define USE_DINK32		1
 #else