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/taishan.h b/include/configs/taishan.h
index faf9e20..12f35ae 100644
--- a/include/configs/taishan.h
+++ b/include/configs/taishan.h
@@ -34,6 +34,8 @@
 #define CONFIG_4xx		1	/* ... PPC4xx family		*/
 #define CONFIG_SYS_CLK_FREQ	33333333 /* external freq to pll	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xFFFC0000
+
 /*
  * Include common defines/options for all AMCC eval boards
  */