tee: core: add support for input/output object parameters

This patch adds support new attribute for objects.

In Qualcomm TZ case, Objects instances are returned from TZ as
part of response to invoke request. And user can also send user
objects like Callback object id to TZ as part of invoke request.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>