CompositionEngine: base inverse transform on primary display

Layers with geomBufferUsesDisplayInverseTransform set (usually layers
showing a camera preview) were not being rotated correctly on external
displays with hardware composition. Forcing GPU composition avoided
the issue, since BufferLayer.prepareClientLayer() uses the *primary*
display's orientation to create the inverse transformation.

But, the HWC path used each screen's orientation, resulting in a bad
layer rotation when the primary and external displays' orientation
differed. So let's do what the GPU path does.

This, of course, only makes a difference when the primary and secondary
display rotations differ. In our case, we noticed the problem when
running the landscape-oriented CinemaPro app, while our default camera,
which runs in portrait, did not have a problem.

Co-authored-by: Mikael Magnusson <mikael.magnusson@sony.com>

Note: This is an updated version of the change with the same Change-Id
as uploaded to AOSP, as refactoring has continued, and more tests were
added since.

Bug: 155329360
Test: the new unit test fails without the patch
Test: the new unit test passes with the patch
Test: record using Cinema Pro app with an external screen
Reference: I0da22423490a93fe943fd59e6c122aa6aaf30b11
Change-Id: I8b4975a14a0ae42d10e4eeaa66385e72ff00c23d

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