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/ERIC.h b/include/configs/ERIC.h
index da3b4ae..094db45 100644
--- a/include/configs/ERIC.h
+++ b/include/configs/ERIC.h
@@ -37,6 +37,8 @@
 #define CONFIG_4xx		1	/* ...member of PPC4xx family	*/
 #define CONFIG_ERIC		1	/* ...on a ERIC board	*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xFFFC0000
+
 #define	CONFIG_BOARD_EARLY_INIT_F 1	/* run board_early_init_f() */
 
 #define CONFIG_SYS_CLK_FREQ	33333333 /* external frequency to pll	*/