GpuStats: Plumb Vulkan api version

This change plumbs the advertised Vulkan api version into GraphicsEnv.
GLES api version and CPU Vulkan api version will be appended when statd
pulls GpuStatsGlobalInfo from GpuStats to save app launch overhead.

Bug: 131866357
Test: build, flash and boot
Change-Id: I7faa924eccc81499cd4f1fd54803e3a62bd3153a