platform/drm-tests: Add DRAM bandwidth measuring tool.

Add dram_tool to platform/drm-tests, which measures DRAM bandwidth
consumption for Mediatek platforms.

BUG=b:217445002
TEST=Tested on Asurada

Change-Id: I60921cf93207c9aec4f5e2d5171eb8e1277f5db0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/drm-tests/+/3611467
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Miguel Casas-Sanchez <mcasas@chromium.org>
Commit-Queue: Justin Green <greenjustin@google.com>
Tested-by: Justin Green <greenjustin@google.com>
2 files changed