[otp_ctrl] Fix a DAI/KDI concurrency issue
[otp_ctrl] Fix a DAI/KDI concurrency issue

Fix #4852

The scrambling datapath mutex was accidentally released in the KDI when
requesting data from EDN.

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

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan