trusty-ipc: Use dma api to provide physical address of buffers.
Prepare for later change where we need to pass a shared memory id
instead of a physical address.
Bug: 128698138
Change-Id: I90257d91d947b2ca04749523a75d6e8402a941b6
Signed-off-by:
Arve Hjønnevåg <arve@android.com>
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