hikey: Enable cache APIs for hikey platform.
hikey: Enable cache APIs for hikey platform.

When decrypting into SDP buffers TA's like Playready
and Widevine need to be able to flush the cache.

Signed-off-by: Peter Griffin <82f81e62be2bf153f8e7977fe8d5e19723573a1d@linaro.org>
Reviewed-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>

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