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/DB64460.h b/include/configs/DB64460.h
index 765eaaf..ef5277e 100644
--- a/include/configs/DB64460.h
+++ b/include/configs/DB64460.h
@@ -58,6 +58,8 @@
 
 #define CONFIG_DB64460		1	/* this is an DB64460 board	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xfff00000
+
 #define CONFIG_BAUDRATE		115200	/* console baudrate = 115000	*/
 /*ronen - we don't use the global CONFIG_ECC, since in the global ecc we initialize the
 	DRAM for ECC in the phase we are relocating to it, which isn't so sufficient.