drm/i915: rename has_edp_a() to ilk_has_edp_a()

Clarify that the name is specific to ILK+ PCH platforms.

v2: prefix the name with ilk rather than pch (Ville)
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190122082307.4003-5-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -14231,7 +14231,7 @@ static int intel_encoder_clones(struct intel_encoder *encoder)
 	return index_mask;
 }
 
-static bool has_edp_a(struct drm_i915_private *dev_priv)
+static bool ilk_has_edp_a(struct drm_i915_private *dev_priv)
 {
 	if (!IS_MOBILE(dev_priv))
 		return false;
@@ -14388,7 +14388,7 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
 
 		dpd_is_edp = intel_dp_is_port_edp(dev_priv, PORT_D);
 
-		if (has_edp_a(dev_priv))
+		if (ilk_has_edp_a(dev_priv))
 			intel_dp_init(dev_priv, DP_A, PORT_A);
 
 		if (I915_READ(PCH_HDMIB) & SDVO_DETECTED) {