cros_bundle_firmware: Fix up exynos memory type binding
cros_bundle_firmware: Fix up exynos memory type binding

The binding for this has changed to be in a /dmc node, so update the
code here.

BUG=chromium-os:19724
TEST=manual: run cros_bundle_firmware
See that it no longer fails with an error about a missing device tree
node.

Change-Id: I646122de90b61b942fc9995ab58fd1f1d2f867e6
Reviewed-on: https://gerrit.chromium.org/gerrit/18319
Reviewed-by: Che-Liang Chiou <57969107b634cf11cb64e9d768fd46929066adab@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@chromium.org>
Tested-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Commit-Ready: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>

marineam/coreos-dev-util,mgireesh05/dev-util,coreos/dev-util,coreos/dev-util,mgireesh05/dev-util,marineam/coreos-dev-util,coreos/dev-util,mgireesh05/dev-util