Game Driver: plumb driver build date into GpuStats

Driver build date is used to track graphics driver age of the Android
ecosystem. This change also make the binder transaction async so that
both GL and Vulkan loaders won't be blocked by GpuStats module in the
GpuService.

Bug: 123156461
Test: Build, flash and boot. Verify the GpuService receiver side.
Change-Id: I89fd94613da2f5be7c28e5a5f8c3ec653f85cd2a