SF: adapt region sampling to display orientation

Pass in the orientation flags of SF to RenderEngine when conducting the
sampling composition. This resulted mis-sampled areas, especially when
the region was outside of the clip of the 0-degree rotated display.

Bug: 132394665
Test: manual verification with 90, 270, 0 rotations
Test: new tests in libsurfaceflinger_unittest#RegionSamplingTest.*
Change-Id: I2869ef191572dbcc9170df8d3ed17414ab053ca4