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/sbc8560.h b/include/configs/sbc8560.h
index 0d0fbdd..a75e4be 100644
--- a/include/configs/sbc8560.h
+++ b/include/configs/sbc8560.h
@@ -46,6 +46,8 @@
 #define CONFIG_MPC85xx		1	/* MPC8540/MPC8560		*/
 #define CONFIG_MPC85xx_REV1	1	/* MPC85xx Rev 1.0 chip		*/
 
+#define	CONFIG_SYS_TEXT_BASE	0xfffc0000
+
 
 #define CONFIG_CPM2		1	/* has CPM2 */
 #define CONFIG_SBC8560		1	/* configuration for SBC8560 board */