goldfish-opengl: be more platform agnostic with

- enable HostVisibleVirtualization on Linux builds
- don't need to #ifdef mRenderNodeFd since it's just an int

BUG=202552093
TEST=./deqp-vk

Change-Id: Iafa9e60a1b10686e01c7e567166b3d659d024578
4 files changed