Exposes PMU-related functions so that we can call the functions to study
some part of cache performance.
BRANCH=none
BUG=b:172988651
TEST=make BOARD=asurada_scp
Signed-off-by: Tzung-Bi Shih <tzungbi@chromium.org>
Change-Id: I27182e3d2af52d8761f45359f3627d70c5acf28c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2567517
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Eric Yilun Lin <yllin@chromium.org>