CHROMIUM: cbootimage: Add Bctcopy parameter

Add the Bctcopy parameter for the bct number in final boot image
file to save the NAND space.
In .cfg file, add "Bctcopy = n(n >= 1)" to specify the bct count.

BUG=chromium-os:17464
TEST=cfg-file

Change-Id: I873a000f9165017db9dec25fb7b18cf082e535ba
Reviewed-on: http://gerrit.chromium.org/gerrit/5207
Reviewed-by: Anton Staaf <[email protected]>
Tested-by: Doug Anderson <[email protected]>
6 files changed