drm/i915: Unduplicate CHV encoders' post pll disable code

The exact same code was used by HDMI and DP encoders, so move it to
intel_dpio_phy.c.

v2: Fix typo in the commit message. (Jim Bride)
v3: Call the new function chv_phy_post_pll_disable() instead of
    chv_phy_post_disable(), as it should be called after the pll
    is disabled. (Ville)

Cc: Jim Bride <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Ander Conselvan de Oliveira <[email protected]>
Reviewed-by: Jim Bride <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/1461761065-21195-7-git-send-email-ander.conselvan.de.oliveira@intel.com

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