platform/drm-tests: Add mali_stats test

Add mali_stats to drm-tests. This test includes a library for accessing
Mali performance counters, along with a simple test program
demonstrating how to use it.

Notes and technical specifications on these performance counters can be
found at go/mali-perf-metrics-notes.

BUG=b:221476799
TEST=Tested on asurada

Change-Id: I2127b04763f6200c6197cf91dac69fb4f4903136
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/drm-tests/+/3502554
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Miguel Casas-Sanchez <mcasas@chromium.org>
Tested-by: Justin Green <greenjustin@google.com>
Commit-Queue: Justin Green <greenjustin@google.com>
10 files changed