TEE_CreatePersistentObject: object is optional
TEE_CreatePersistentObject: object is optional

As specified in GlobalPlatform Internal API v1.1 on
TEE_CreatePersistentObject():
    [...] and optionally returns either a handle on the created object,
    or TEE_HANDLE_NULL upon failure

Reviewed-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>
Signed-off-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@st.com>

pascal-brand-st-dev/optee_os,matt2048/optee_os,matt2048/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,matt2048/optee_os,matt2048/optee_os,pascal-brand-st-dev/optee_os