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/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index b0f5cbd..2e6cc51 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -27,7 +27,11 @@
 
 #ifdef CONFIG_NAND
 #define CONFIG_NAND_U_BOOT		1
-#define CONFIG_RAMBOOT_TEXT_BASE	0x00100000
+#define CONFIG_SYS_TEXT_BASE	0x00100000
+#endif
+
+#ifndef CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_TEXT_BASE	0xFE000000
 #endif
 
 /*