fip: signing: support identify general variant parameter [1/1]

PD#SWPL-171076

Problem:
Need update signing tool

Solution:
update scripts for it

Verify:
local

Change-Id: I5b48ddd5636afae9ba090acdd3d5e71db5755192
Signed-off-by: Zhongfu Luo <zhongfu.luo@amlogic.com>
13 files changed