Add the support for the signature of livepatched modules, so we can
avoid the unsigned kernel module loading issue.
Test Plan:
Pass: Verify the kpatch-build building process.
Pass: Execute shellcheck tool without errors and warnings for
the kpatch-build script after applying this patch.
Story: 2009221
Task: 44580
Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
Change-Id: Ieb56539b873dab3eab350797b8c3ab2d8923ef5d
0ac0effe14