drm/i915/pvc: Extract stepping information from PCI revid

For PVC, the base die and compute tile have separate stepping values
that we need to track; we'll use the existing graphics_step field to
represent the compute tile stepping and add a new 'basedie_step' field.

Unlike past platforms, steppings for these components are represented by
specific bitfields within the PCI revision ID, and we shouldn't make
assumptions about the non-CT, non-BD bits staying 0.  Let's update our
stepping code accordingly.

Bspec: 44484
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Matt Atwood <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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