drm/i915: Remove redundant toggling from the power well sync_hw hooks

Doing an explicit enable/disable in the power well sync_hw hook based on
the power well's reference count is redundant, since by the time these
hooks are called all the power wells are enabled and have a reference.
So remove the redundant toggling.

This is needed by a follow-up patchset that adds power wells which we
can't enable/disable during power domain initialization and so want to
preserve their state until modeset init time.

Cc: Ander Conselvan de Oliveira <[email protected]>
Cc: David Weinehall <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Ander Conselvan de Oliveira <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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