[CLion] Remove legacy SurfaceFlinger CMakeLists.txt.

Now that we move SurfaceFlinger to use blueprint, we no longer need to write
manual CMakeLists.txt for SurfaceFlinger. This patch updates the native
CMakeLists.txt and removes the legacy file.

Test: make
Change-Id: I4097c5d3f564a47b0238bce62bb818b2835ceafc
2 files changed