Set size of FMAP section correctly

This was set to the size of the image, but should be the size of just the
FMAP section itself.

BUG=chromium-os:17187
TEST=cros_bundle_firmware --outdir out; Manually heck that FMAP area size
is 0x400

Change-Id: I861b36d2e8b5c215a54b4c0e6a1c4387ee7884d6
Reviewed-on: http://gerrit.chromium.org/gerrit/4172
Tested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed