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/katmai.h b/include/configs/katmai.h
index e4ccd7d..135a4c2 100644
--- a/include/configs/katmai.h
+++ b/include/configs/katmai.h
@@ -41,6 +41,8 @@
 #define CONFIG_SYS_CLK_FREQ	33333333	/* external freq to pll	*/
 #define CONFIG_SYS_4xx_RESET_TYPE	0x2	/* use chip reset on this board	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xFFFA0000
+
 /*
  * Enable this board for more than 2GB of SDRAM
  */