FIP: Add build args to generate unsigned bootloader [1/1]

PD#SWPL-73784

Problem:
FIP: Add build args to generate unsigned bootloader

Solution:
FIP: Add a build args "--build-unsign"

Verify:
build pass

Change-Id: I4d77233c6aecd24360e4c6be232d4f376bd85d4a
Signed-off-by: Zhongfu Luo <zhongfu.luo@amlogic.com>
7 files changed