drm/i915/gt: Implement creation and removal routines for CCS engines

In preparation for upcoming patches, we need routines to
dynamically create and destroy CCS engines based on the CCS mode
that the user wants to set.

The process begins by calculating the engine mask for the engines
that need to be added or removed. We then update the UABI list of
exposed engines and create or destroy the corresponding sysfs
interfaces accordingly.

These functions are not yet in use, so no functional changes are
intended at this stage.

Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>

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