SF: Handle buffer scale transforms when calculating layer geometry

In addition to layer transforms, buffer scale transform applied to a layer should be applied to all
its children. This is to ensure WM can treat child surfaces as pixels in the parent surface.

Current bounds calculations is based on the cropped parent bounds in parent layer space and its
effective transform. This breaks because if the parent buffer has a scale transform, the parent
bounds passed on to the child already has the buffer scale transform applied to it.

To fix this, we undo the scale transform on the cropped parent bounds before passing it on to its
children for cropping.

Fixes: 127368943
Test: atest SurfaceFlinger_test
Test: go/wm-smoke
Change-Id: I17966d08b98fbfbf44538cab0a95c9e78b23e11e