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/SCM.h b/include/configs/SCM.h
index a114f6c..6f8c28e 100644
--- a/include/configs/SCM.h
+++ b/include/configs/SCM.h
@@ -38,6 +38,8 @@
 #define CONFIG_SCM              1	/* ...on a System Controller Module	*/
 #define CONFIG_CPM2		1	/* Has a CPM2 */
 
+#define	CONFIG_SYS_TEXT_BASE	0x40000000
+
 #if (CONFIG_TQM8260 <= 100)
 #  error "TQM8260 module revison not supported"
 #endif