Refine PRIVATE_FLAG_LAYOUT_SIZE_EXTENDED_BY_CUTOUT

- If a window has PRIVATE_FLAG_LAYOUT_SIZE_EXTENDED_BY_CUTOUT, the final
  frame might be larger than the requested size, and we cannot use the
  requested lengths to compute the window frame. Because the window size
  will be the new requested size, we don't want to extend the window
  size again and again.

- When we are checking if a frame is overlapped with the display cutout,
  we only need to check if displayCutoutSafe contains the frame. We
  don't need to check individual bounding rectangles. This also fixes an
  issue that the gestural navigation bar is not extended by the
  waterfall cutout because it doesn't have bounding rectangles.

Bug: 203031262
Bug: 161810301
Test: Enable double cutout or waterfall cutout in developer options and
      see if the frame of navigation bar is correct when it is at the
      same side of the cutout.
Change-Id: Ic8c090198c556f2dc3b2c0b8498c42e9ca18c795