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/Yukon8220.h b/include/configs/Yukon8220.h
index 273b4e2..398a70d 100644
--- a/include/configs/Yukon8220.h
+++ b/include/configs/Yukon8220.h
@@ -31,6 +31,8 @@
 #define CONFIG_MPC8220		1
 #define CONFIG_YUKON8220	1	/* ... on Yukon board	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xfff00000
+
 #define CONFIG_BAT_RW		1	/* Use common BAT rw code */
 #define CONFIG_HIGH_BATS	1	/* High BATs supported */