drm/i915/bxt: Add MST support when do DPLL calculation

Add the missing INTEL_OUTPUT_DP_MST case in bxt_get_dpll()
to correctly initialize the crtc_state and port plls when
link training a DP MST monitor on BXT/APL devices.

Fixes: a277ca7d ("drm/i915: Split bxt_ddi_pll_select()")
Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=99572Reviewed-by: NCooper Chiou <cooper.chiou@intel.com>
Reviewed-by: NGary C Wang <gary.c.wang@intel.com>
Reviewed-by: NCiobanu, Nathan D <nathan.d.ciobanu@intel.com>
Reviewed-by: NHerbert, Marc <marc.herbert@intel.com>
Reviewed-by: NBride, Jim <jim.bride@intel.com>
Reviewed-by: NNavare, Manasi D <manasi.d.navare@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: NLee, Shawn C <shawn.c.lee@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486096329-6255-1-git-send-email-shawn.c.lee@intel.com
(cherry picked from commit 0aab2c72)
Signed-off-by: NJani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_dpll_mgr.c

@@ -1730,7 +1730,8 @@ bxt_get_dpll(struct intel_crtc *crtc,
 		return NULL;
 
 	if ((encoder->type == INTEL_OUTPUT_DP ||
-	     encoder->type == INTEL_OUTPUT_EDP) &&
+	     encoder->type == INTEL_OUTPUT_EDP ||
+	     encoder->type == INTEL_OUTPUT_DP_MST) &&
 	    !bxt_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state))
 		return NULL;