{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/spi/tpm/tpm.c

@@ -728,12 +728,12 @@ size_t tpm2_process_command(const void *tpm2_command, size_t command_size,
 	return payload_size;
 }
 
-cb_err_t tis_vendor_write(unsigned int addr, const void *buffer, size_t bytes)
+enum cb_err tis_vendor_write(unsigned int addr, const void *buffer, size_t bytes)
 {
 	return tpm2_write_reg(addr, buffer, bytes);
 }
 
-cb_err_t tis_vendor_read(unsigned int addr, void *buffer, size_t bytes)
+enum cb_err tis_vendor_read(unsigned int addr, void *buffer, size_t bytes)
 {
 	return tpm2_read_reg(addr, buffer, bytes);
 }