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/NC650.h b/include/configs/NC650.h
index b0a42d6..8d1d45d 100644
--- a/include/configs/NC650.h
+++ b/include/configs/NC650.h
@@ -36,6 +36,8 @@
 #define CONFIG_MPC852T		1
 #define CONFIG_NC650		1
 
+#define	CONFIG_SYS_TEXT_BASE	0x40700000
+
 #define	CONFIG_8xx_CONS_SMC1	1	/* Console is on SMC1		*/
 #undef	CONFIG_8xx_CONS_SMC2
 #undef	CONFIG_8xx_CONS_NONE