drm/i915/lmem: Bypass aperture when lmem is available

In the scenario where local memory is available, we have
rely on CPU access via lmem directly instead of aperture.

v2:
gmch is only relevant for much older hw, therefore we can drop the
has_aperture check since it should always be present on such platforms.
(Chris)

Cc: Ville Syrjälä <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Chris P Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: CQ Tang <[email protected]>
Signed-off-by: Anusha Srivatsa <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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