drm/i915/gt: nuke gen6_hw_id

This is only used by GRAPHICS_VER == 6 and GRAPHICS_VER == 7. All other
recent platforms do not depend on this field, so it doesn't make much
sense to keep it generic like that. Instead, just do a mapping from
engine class to HW ID in the single place that is needed.

v2: use macros with the direct register address instead of calculating
from the legacy HW_ID (Matt Roper)

Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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