drm/i915: Add struct to hold IP version

Adding a structure to standardize access to IP versioning as future
platforms will have this information populated at runtime.

The constant platform display version is not using this new struct but
the runtime variant will definitely use it.

Cc: Radhakrishna Sripada <[email protected]>
Cc: Matt Atwood <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Caz Yokoyama <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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