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/stxgp3.h b/include/configs/stxgp3.h
index abc48b3..5e71d74 100644
--- a/include/configs/stxgp3.h
+++ b/include/configs/stxgp3.h
@@ -43,6 +43,8 @@
 #define CONFIG_STXGP3		1	/* Silicon Tx GPPP board specific*/
 #define CONFIG_MPC8560		1
 
+#define	CONFIG_SYS_TEXT_BASE	0xfff80000
+
 #undef  CONFIG_PCI			/* pci ethernet support	*/
 #define CONFIG_TSEC_ENET		/* tsec ethernet support*/
 #undef  CONFIG_ETHER_ON_FCC             /* cpm FCC ethernet support */