ANDROID: trusty: Implement share-memory interface based on Arm FF-A 1.0 EAC 1_0

If trusty runs in an environment where it does not have access to all
memory, any memory passed to trusty must be explicitly shared.

Bug: 128698138
Change-Id: I42c8acad0e77ab6e19c76ed1ee0777c9e091e023
Signed-off-by: Arve Hjønnevåg <arve@android.com>