fip: s7 support signpipe for HSM based signing flow [1/1]

PD#SH-13229

Problem:
S7: Need support HSM based signing mechanism

Solution:
S7: support signpipe

Verify:
S7 s7_bh209

Change-Id: I54c9e021c89af56474d5ba644af77e47bb1ecaef
Signed-off-by: Huaihong Lei <huaihong.lei@amlogic.com>
8 files changed