SensorEventQueue: Allow setRate on sensor enable

4.3 and earlier would set the sensor rate on activation and then set it again
when setRate was called.

Some sensor HALs assume this will happen and ignore the first setRate

Conditionally the first one back in for such broken HALs

Change-Id: If1c259b0fd5517a1272cdad0a1abf1fe0fb5a7d1
surfaceflinger: Set max acquired buffer count

If triple framebuffers are enabled, the number of acquired
buffers isn't increased by default. Set the count to one less
than the max buffers to make sure all three buffers come into
play.

Change-Id: I65054ed4004607f5be68c893f6f621e821cfbf1c