Revert "cros:bundle_firmware: Update RW A/B FDTs with blob positions"

This reverts commit a3c7ca890519a7d5ae7fcb5b4cf365b3bf1839d8.

BUG=chrome-os-partner:14545
BRANCH=link
TEST=none

Change-Id: I643d3bc94828ae364a9c7fae8222eaf10845dcef
Reviewed-on: https://gerrit.chromium.org/gerrit/36525
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Tested-by: Bill Richardson <wfrichar@chromium.org>
diff --git a/host/lib/bundle_firmware.py b/host/lib/bundle_firmware.py
index 388959c..4059577 100644
--- a/host/lib/bundle_firmware.py
+++ b/host/lib/bundle_firmware.py
@@ -846,8 +846,6 @@
 
     # Record position and size of all blob members in the FDT
     pack.UpdateBlobPositions(fdt)
-    pack.UpdateBlobPositions(fdt_rwa)
-    pack.UpdateBlobPositions(fdt_rwb)
 
     # TODO(sjg@chromium.org): This is not in a good place. _CreateCorebootStub
     # has created a rom file without the dtb, because until now it is not