smcinvoke: add support of secure memory objects

SMCInvoke provides communication trusted clients and applications.
However, to send large buffers, it s reccommended to use memory objects.
If memory objects are coming from heaps which have not been registered
with SHMBridge, invoke operation would fail. Adding support to register
bridges for memory objects if those are coming from secure heaps.

Change-Id: Id13822f877b2ffb1886411705ffcbf1e3ef2a98a
Signed-off-by: Gaurav Kashyap <gaurkash@codeaurora.org>