libmeminfo: add GPU total memory tests

Add tests for ReadGpuTotalUsageKb API function which reads GPU usage data
reported by kernel via /sys/fs/bpf/map_gpu_mem_gpu_mem_total_map node.
VTS tests requires this interface to be present for devices launching
with Android S and having 5.4 or higher kernel version.

Bug: 171261987
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ib2cd1d3879ebfa65c3be36bc3a574ae7b20f31a9
3 files changed