drm/i915/display: Check mappable aperture when pinning preallocated vma

When system does not have mappable aperture, ggtt->mappable_end=0. In
this case if we pass PIN_MAPPABLE when pinning vma, the pinning code
will return -ENOSPC. So conditionally set PIN_MAPPABLE if HAS_GMCH().

Suggested-by: Chris P Wilson <[email protected]>
Signed-off-by: CQ Tang <[email protected]>
Cc: Radhakrishna Sripada <[email protected]>
Cc: Ap Kamal <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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