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MST ports did not had the post_pll_disable() hook causing the
references get in pre_pll_enable() never being released causing
DDI and AUX CH being enabled all the times.

v2: renamed intel_mst_post_pll_disable_dp() parameters
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181107235449.32264-2-jose.souza@intel.com