drm/i915: Introduce lpt_pch_disable()

Let's add lpt_pch_disable() as the counterpart to
lpt_pch_enable().

Note that unlike the ilk+ code the fdi_link_train()
and fdi_disable() calls are still left directly in
intel_crt.c. If we wanted to move those we'd need to
add lpt_pch_pre_enable(). But the two fdi direct fdi
calls are pretry symmetric so it doesn't seem too bad
to just keep them as is.

v2: Make lpt_disable_pch_transcoder() static ([email protected])

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

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