trusty: rpmb_dev: Prevent desync between rpmb_dev and storageproxyd

The mock RPMB can get out of sync with TD storage blocks in the event of
panic or crash. Making this O_SYNC will prevent this from happening.

Bug: 160723681
Test: None
Change-Id: Ia16dfc88ceae56e4e9724a42ac0db492c0e707a4
1 file changed