Recycle PooledLambda in CameraDeviceImpl.CameraDeviceCallbacks

PooledRunnable has a nice optional method recycleOnUse(), which can be
used if the Runnable is guaranteed to be executed at most once.

By calling this method, PooledRunnable instance will be auto-recycled
into the internal object pool once it's executed.

Test: presubmit
Change-Id: I6ff341be5d0abddba8134489950be0b7c1affcbb