{drivers/security}: Replace cb_err_t with enum cb_err

This patch replaces remaining `cb_err_t` with `enum cb_err` after commit
hash 69cc557c (commonlib/bsd: Remove cb_err_t) removes majority of
`cb_err_t` instances.

TEST=Able to build the brya.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I3392f9c2cfb4a889a999c8ea25066c89979f0900
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62676
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/drivers/tpm/cr50.h

@@ -16,9 +16,9 @@ struct cr50_firmware_version {
 bool cr50_is_long_interrupt_pulse_enabled(void);
 
 /* Get the Cr50 firmware version information. */
-cb_err_t cr50_get_firmware_version(struct cr50_firmware_version *version);
+enum cb_err cr50_get_firmware_version(struct cr50_firmware_version *version);
 
 /* Set the BOARD_CFG register depending on Cr50 Kconfigs */
-cb_err_t cr50_set_board_cfg(void);
+enum cb_err cr50_set_board_cfg(void);
 
 #endif /* __DRIVERS_TPM_CR50_H__ */