drm/i915/guc: A little bit more of doorbell sanitization

Some recent refactoring patches have left the doorbell creation outside
the GuC client allocation, which does not make a lot of sense (a client
without a doorbell is something useless). Move it back there, and
refactor the init_doorbell_hw consequently.

Thanks to this, we can do some other improvements, like hoisting the
check for GuC submission enabled out of the enable function.

v2: Rebased.

Signed-off-by: Oscar Mateo <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: Arkadiusz Hiler <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Reviewed-by: Joonas Lahtinen <[email protected]>
Signed-off-by: Joonas Lahtinen <[email protected]>

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