[otp_ctrl] Add missing unlock action to life cycle partition
[otp_ctrl] Add missing unlock action to life cycle partition

The life cycle partition did not properly unlock the buffer regs before,
and since the unlock signal also determines the init_done signal, it
looked like the life cycle partition never really initialized (although
it actually did).

Signed-off-by: Michael Schaffner <a005a2d3342a687ea2d05360c953107acbe83e08@opentitan.org>

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