drm/i915: digital_port_connected sort platforms newer-to-older

Just sorting this "if" block from newer to older platform.

The main difference here is the addition of a
missing case with return false that should never occur.
And if it occurs it is better than to raise a warn
than use the icl one.

The gen >= 11 was already present in the previous logic,
although hidden.

So, in summary no real functional change.

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181022171526.15641-3-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/intel_dp.c

@@ -5035,20 +5035,23 @@ bool intel_digital_port_connected(struct intel_encoder *encoder)
 			return g4x_digital_port_connected(encoder);
 	}
 
-	if (IS_GEN5(dev_priv))
-		return ilk_digital_port_connected(encoder);
-	else if (IS_GEN6(dev_priv))
-		return snb_digital_port_connected(encoder);
-	else if (IS_GEN7(dev_priv))
-		return ivb_digital_port_connected(encoder);
-	else if (IS_GEN8(dev_priv))
-		return bdw_digital_port_connected(encoder);
+	if (INTEL_GEN(dev_priv) >= 11)
+		return icl_digital_port_connected(encoder);
+	else if (IS_GEN10(dev_priv) || IS_GEN9_BC(dev_priv))
+		return spt_digital_port_connected(encoder);
 	else if (IS_GEN9_LP(dev_priv))
 		return bxt_digital_port_connected(encoder);
-	else if (IS_GEN9_BC(dev_priv) || IS_GEN10(dev_priv))
-		return spt_digital_port_connected(encoder);
-	else
-		return icl_digital_port_connected(encoder);
+	else if (IS_GEN8(dev_priv))
+		return bdw_digital_port_connected(encoder);
+	else if (IS_GEN7(dev_priv))
+		return ivb_digital_port_connected(encoder);
+	else if (IS_GEN6(dev_priv))
+		return snb_digital_port_connected(encoder);
+	else if (IS_GEN5(dev_priv))
+		return ilk_digital_port_connected(encoder);
+
+	MISSING_CASE(INTEL_GEN(dev_priv));
+	return false;
 }
 
 static struct edid *