Change in coreboot[master]: {drivers/security}: Replace `cb_err_t` with `enum cb_err`

[Eric Lai (Code Review)]

Attention is currently required from: Patrick Georgi, Subrata Banik, Tim Wawrzynczak, Christian Walter, Angel Pons, Julius Werner, Nick Vaccaro, Lean Sheng Tan, Werner Zeh.
Eric Lai has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62676 )

Change subject: {drivers/security}: Replace `cb_err_t` with `enum cb_err`
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Patch Set 1: Code-Review+2