ppc4xx: acadia: Add fdt support and fix section overlap problem

This patch adds fdt (flattened device tree) support to the AMCC
Acadia eval board. This increases the image size and it doesn't
fit anymore into 256kByte. Since we didn't want to remove features
from the configuration, we decided to increase the U-Boot image size
(add one flash sector).

Also changed the default environment definition to make it
independent of such changes.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/amcc/acadia/config.mk b/board/amcc/acadia/config.mk
index af5a46c..290415c 100644
--- a/board/amcc/acadia/config.mk
+++ b/board/amcc/acadia/config.mk
@@ -28,7 +28,7 @@
 sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
 
 ifndef TEXT_BASE
-TEXT_BASE = 0xFFFC0000
+TEXT_BASE = 0xFFF80000
 endif
 
 ifeq ($(debug),1)