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/mucmc52.h b/include/configs/mucmc52.h
index f87dc9c..101788a 100644
--- a/include/configs/mucmc52.h
+++ b/include/configs/mucmc52.h
@@ -35,6 +35,10 @@
 #define	CONFIG_MUCMC52		1	/* MUCMC52 board	*/
 #define	CONFIG_HOSTNAME		mucmc52
 
+#ifndef CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_TEXT_BASE	0xFFF00000
+#endif
+
 #include "manroland/common.h"
 #include "manroland/mpc5200-common.h"