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/lwmon.h b/include/configs/lwmon.h
index be20d72..3b7293a 100644
--- a/include/configs/lwmon.h
+++ b/include/configs/lwmon.h
@@ -39,6 +39,8 @@
 #define CONFIG_MPC823		1	/* This is a MPC823E CPU	*/
 #define CONFIG_LWMON		1	/* ...on a LWMON board		*/
 
+#define	CONFIG_SYS_TEXT_BASE	0x40000000
+
 /* Default Ethernet MAC address */
 #define CONFIG_ETHADDR          00:11:B0:00:00:00