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/IAD210.h b/include/configs/IAD210.h
index ea1e706..54e8a72 100644
--- a/include/configs/IAD210.h
+++ b/include/configs/IAD210.h
@@ -44,6 +44,8 @@
 #define CONFIG_MPC860T		1
 #define CONFIG_MPC862		1
 
+#define	CONFIG_SYS_TEXT_BASE	0x08000000
+
 #define CONFIG_LOADS_ECHO	1	/* echo on for serial download	*/
 
 #undef  CONFIG_8xx_CONS_SMC1