drm/i915: Add .get_hw_state() method for planes

Add a .get_hw_state() method for planes, returning true or false
depending on whether the plane is enabled. Use it to rewrite the
plane enabled/disabled asserts in platform agnostic fashion.

We do lose the pre-gen4 plane<->pipe mapping checks, but since we're
supposed sanitize that anyway it doesn't really matter.

v2: Reoder patches to not depend on enum old_plane_id
    Just call assert_plane_disabled() from assert_planes_disabled()
v3: Deal with disabled power wells in .get_hw_state()
v4: Rebase due skl primary plane code removal

Cc: Thierry Reding <[email protected]>
Cc: Alex Villacís Lasso <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]> #v2
Tested-by: Thierry Reding <[email protected]> #v2
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Ville Syrjälä <[email protected]>

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