drm/i915: move pipe, pch and vblank enable to encoders on DDI platforms

To allow better flexibility for encoder specific code, push
intel_enable_pipe(), lpt_pch_enable() and intel_crtc_vblank_on() down to
the encoders from hsw_crtc_enable().

There's slight duplication, but also more clarity with the reduced
conditional statements.

Cc: Vandita Kulkarni <[email protected]>
Cc: Ville Syrjala <[email protected]>
Reviewed-by: Vandita Kulkarni <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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