drm/i915/pxp: Add MTL hw-plumbing enabling for KCR operation

Add MTL hw-plumbing enabling for KCR operation under PXP
which includes:

1. Updating 'pick-gt' to get the media tile for
   KCR interrupt handling
2. Adding MTL's KCR registers for PXP operation
   (init, status-checking, etc.).

While doing #2, lets create a separate registers header file for PXP
to be consistent with other i915 global subsystems.

Signed-off-by: Alan Previn <[email protected]>
Reviewed-by: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Radhakrishna Sripada <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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