Close HardwareBuffer used by rotation animation

The HardwareBuffer used to rely on garbage collection to release.
Since WMS.H#FROCE_GC is removed for reducing random delay, the
buffer references should be released explicitly after use. Otherwise
the lifetime of the buffer on native side may be too long, because
system may not trigger GC frequently.

Note that setBuffer will add a reference to the buffer. So the
close() can be called right after that.

Bug: 264650822
Test: Rotate screen many times, the number from
      adb shell dmabuf_dump -a | grep 10200 | wc -l
      adb shell dmabuf_dump -b | grep 10240000 | wc -l
      should not keep increasing.
      (10200,10240000 may be different according1020 to screen size)
Change-Id: I39c052ccf8f7ae7a5914532ee61596a336af0993