[keymgr/dv] Update scb for sw_binding_en
[keymgr/dv] Update scb for sw_binding_en

due to #5105, sw_binding_en wasn't actually verified before
After solved that issue, found some issues in scb (which is fixed in this PR)
and design issue at #5124

Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

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