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/board/ids8247/config.mk b/board/ids8247/config.mk
index 1aee97c..c39beb8 100644
--- a/board/ids8247/config.mk
+++ b/board/ids8247/config.mk
@@ -24,12 +24,4 @@
 #
 # IDS 8247 Board
 #
-
-# This should be equal to the CONFIG_SYS_FLASH_BASE define in config_IDS8247.h
-# for the "final" configuration, with U-Boot in flash, or the address
-# in RAM where U-Boot is loaded at for debugging.
-#
-CONFIG_SYS_TEXT_BASE = 0xfff00000
-
-PLATFORM_CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) \
-	-I$(TOPDIR)
+PLATFORM_CPPFLAGS += -I$(TOPDIR)