drm/i915: Turn vgpu pdps into an array

drm/i915: Turn vgpu pdps into an array

We'll want to avoid performing arithmetic with register offsets, so
instead calculating the vgpu PDP as pdp0_lo+offset, make the PDPs
into an array. This way we can simply loop through them.

Cc: Eddie Dong <[email protected]>
Cc: Jike Song <[email protected]>
Cc: Kevin Tian <[email protected]>
Cc: Yu Zhang <[email protected]>
Cc: Zhi Wang <[email protected]>
Cc: Zhiyuan Lv <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Zhiyuan Lv <[email protected]>