pack.py: included lkboot in single image

Added an additional option '--lk'.
With this option '--lk' included, pack script will
use lkboot.mbn instead of u-boot.mbn for APPSBL.

This option applies to 'emmc' only image.
Other flash types will discard this option.

Applies to ipq806x and ipq40xx SoCs.

Change-Id: Ic3b5a3398e3d007fe1d144e069e62a6157b9a2ef
Signed-off-by: Gokul Sriram Palanisamy <gokulsri@codeaurora.org>
1 file changed