drm/i915/pmu: Make PMU sample array two-dimensional

No functional changes but we can remove some unsightly index computation
and read/write functions if we convert the PMU sample array from a
one-dimensional to a two-dimensional array.

v2: Retain read/store helpers (Tvrtko)

Suggested-by: Tvrtko Ursulin <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Signed-off-by: Ashutosh Dixit <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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