Sensor event direct report mode implementation

Implementation of sensor direct report API. In this verison, only
ashmem(MemoryFile) backed direct channel is implemented. Support
of HardwareBuffer class will come in a following CL.

Test: tested with demo app
Bug: 30985702
Change-Id: I29cae5cb2615c7a128fe203ed1545c03010ca4aa
5 files changed