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/METROBOX.h b/include/configs/METROBOX.h
index 2e63306..04ae4f8 100644
--- a/include/configs/METROBOX.h
+++ b/include/configs/METROBOX.h
@@ -109,6 +109,9 @@
 #define CONFIG_BOARD_EARLY_INIT_F 1	     /* Call board_pre_init	*/
 #define CONFIG_MISC_INIT_F	  1	     /* Call board misc_init_f	*/
 #define CONFIG_MISC_INIT_R	  1	     /* Call board misc_init_r	*/
+
+#define	CONFIG_SYS_TEXT_BASE	0xFFF80000
+
 #undef	CONFIG_SYS_DRAM_TEST			     /* Disable-takes long time!*/
 #define CONFIG_SYS_CLK_FREQ	  66666666   /* external freq to pll	*/