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/cm5200.h b/include/configs/cm5200.h
index 2893351..84311e3 100644
--- a/include/configs/cm5200.h
+++ b/include/configs/cm5200.h
@@ -31,6 +31,8 @@
 #define CONFIG_MPC5200		1	/* (more precisely an MPC5200 CPU) */
 #define CONFIG_CM5200		1	/* ... on CM5200 platform */
 
+#define	CONFIG_SYS_TEXT_BASE	0xfc000000
+
 #define CONFIG_HIGH_BATS	1	/* High BATs supported */
 
 /*