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/bmw/config.mk b/board/bmw/config.mk
index 4a05c8c..a1a44e5 100644
--- a/board/bmw/config.mk
+++ b/board/bmw/config.mk
@@ -22,11 +22,9 @@
 #
 
 #
-# CU824 board
+# BMW board
 #
 
-CONFIG_SYS_TEXT_BASE = 0xFFF00000
 # NOTE: The flags below affect how the BCM570x driver is compiled
 PLATFORM_CPPFLAGS += -DEMBEDDED -DBIG_ENDIAN_HOST -DINCLUDE_5701_AX_FIX=1\
-		     -DDBG=0 -DT3_JUMBO_RCV_RCB_ENTRY_COUNT=256\
-		     -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
+		     -DDBG=0 -DT3_JUMBO_RCV_RCB_ENTRY_COUNT=256