drm/i915/gt: Track the overall awake/busy time

drm/i915/gt: Track the overall awake/busy time

Since we wake the GT up before executing a request, and go to sleep as
soon as it is retired, the GT wake time not only represents how long the
device is powered up, but also provides a summary, albeit an overestimate,
of the device runtime (i.e. the rc0 time to compare against rc6 time).

v2: s/busy/awake/
v3: software-gt-awake-time and I915_PMU_SOFTWARE_GT_AWAKE_TIME

Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Cc: Matthew Brost <[email protected]>
Reported-by: kernel test robot <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]