ECC: ECDH at GP level
ECC: ECDH at GP level

Following derive key algorithm of Global Platform Internal Core API v1.1
are implemented:
    TEE_ALG_ECDH_P192
    TEE_ALG_ECDH_P224
    TEE_ALG_ECDH_P256
    TEE_ALG_ECDH_P384
    TEE_ALG_ECDH_P521

Reviewed-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>
Reviewed-by: Cedric Chaumont <8e86d8823993508e2add6a996501a29b179cbfca@linaro.org>
Tested-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org> (QEMU platform)
Signed-off-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@st.com>

cedric-chaumont-st-dev/optee_os,BreezeWu/optee_os,pascal-brand-st-dev/optee_os,Microsoft/optee_os,cedric-chaumont-st-dev/optee_os,BreezeWu/optee_os,chshxi1989/optee_os,BreezeWu/optee_os,BreezeWu/optee_os,matt2048/optee_os,Microsoft/optee_os,cedric-chaumont-st-dev/optee_os,matt2048/optee_os,Microsoft/optee_os,chshxi1989/optee_os,Microsoft/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,matt2048/optee_os,chshxi1989/optee_os,Microsoft/optee_os,chshxi1989/optee_os,matt2048/optee_os,chshxi1989/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,BreezeWu/optee_os,cedric-chaumont-st-dev/optee_os