Sensor direct report HardwareBuffer implementation

Implemented API for sensor direct channel creating with HardwareBuffer
shared memory. Also, simplified jni code for ashmem shared memory direct
channel.

Bug: 30985702
Test: cts-tradefed run cts --module CtsSensorTestCases
      --test android.hardware.cts.SensorDirectReportTest
Test: cts-tradefed run cts --module CtsSensorTestCases
      --test android.hardware.cts.SensorNativeTest

Change-Id: I067fe21808cf370e4a659fc762131ed3007334a8