FIP: TXHD2: support secure boot V3 [3/3]

PD#SWPL-125683

Problem:
TXHD2: support secure boot V3

Solution:
TXHD2: script signing tool support secure boot V3

Verify:
TXHD2 BE319

Change-Id: I818311b2d04361f64995c026617d903b68e40efd
Signed-off-by: Zhongfu Luo <zhongfu.luo@amlogic.com>
6 files changed