drm/i915/huc: use const struct bus_type pointers

The struct bus_type pointers in the functions
intel_huc_register_gsc_notifier() and
intel_huc_unregister_gsc_notifier() should be a const pointer, as the
structure is not modified anywhere in the functions, and the pointer
they are passed will be a const * in the near future.

Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Alan Previn <[email protected]>
Cc: John Harrison <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Tony Ye <[email protected]>
Cc: Vitaly Lubart <[email protected]>
Cc: [email protected]
Cc: [email protected]
Acked-by: Tvrtko Ursulin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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