drm/i915/bdw: Fix DP_AUX_CH_CTL_TIME_OUT setting

Per BSpec, 400us is "BDW+ Do not use this setting." - not just PORT_A.
Set BDW to 600us unconditionally.

v2:
-Split in to two patches (Rodrigo)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: James Ausmus <james.ausmus@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171012213037.4245-2-james.ausmus@intel.com

drivers/gpu/drm/i915/intel_dp.c

@@ -1007,7 +1007,7 @@ static uint32_t g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
 	else
 		precharge = 5;
 
-	if (IS_BROADWELL(dev_priv) && intel_dig_port->port == PORT_A)
+	if (IS_BROADWELL(dev_priv))
 		timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
 	else
 		timeout = DP_AUX_CH_CTL_TIME_OUT_400us;