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/LANTEC.h b/include/configs/LANTEC.h
index 6e8a4b8..d10958d 100644
--- a/include/configs/LANTEC.h
+++ b/include/configs/LANTEC.h
@@ -40,6 +40,8 @@
 #define CONFIG_MPC850		1	/* This is a MPC850 CPU		*/
 #define CONFIG_LANTEC		2	/* ...on a Lantec rev.2 board	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0x40000000
+
 /*
  *  Port assignments (CONFIG_LANTEC == 1):
  *  - SMC1: J11 (MDB) ?