Fix SensorBatchingFifoTest EOB bug

Fix a bug in SensorBatchingFifoTest when the sensor max fifo size is much
greater than reserved fifo size. After the change, the test will examine
the reserved fifo size and see if it met the spec.

Bug: b/25602082
Change-Id: I3bcc2e0485dd45ec34cb936d5cc5ad1f76ce8d59
3 files changed