Note Ganesh vs. Graphite in RenderEngine's dumpsys section

Also remove empty lines between dumped Vulkan extensions, which improves
overall legibility of the section IMO.

Bug: b/293371537
Test: Manual validation of `dumpsys SurfaceFlinger` across backends
Flag: EXEMPT log only update
Change-Id: I25a7f09d2adbdc2c2859fac154a038485aea2484