The way that secure boot is implemented today on NXP ARM platforms does not reuse the elements found in include/config_fsl_chain_trust.h to construct CONFIG_SECBOOT but instead board header files have their environment setup as needed and then fsl_setenv_chain_of_trust() will set secureboot in the environment. Remove a large number of unused defines here. Cc: Peng Fan <peng.fan@nxp.com> Signed-off-by: Tom Rini <trini@konsulko.com>