drm/i915/hdmi: Remove redundant IS_VLV checks

Those functions are only used on vlv platforms, so no need to check.
Especially if we're not too consistent about it.
Reviewed-by: Naresh Kumar Kachhi <naresh.kumar.kachhi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_hdmi.c

@@ -1157,9 +1157,6 @@ static void vlv_hdmi_pre_enable(struct intel_encoder *encoder)
 	int pipe = intel_crtc->pipe;
 	u32 val;
 
-	if (!IS_VALLEYVIEW(dev))
-		return;
-
 	/* Enable clock channels for this port */
 	mutex_lock(&dev_priv->dpio_lock);
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
@@ -1205,9 +1202,6 @@ static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
 	enum dpio_channel port = vlv_dport_to_channel(dport);
 	int pipe = intel_crtc->pipe;
 
-	if (!IS_VALLEYVIEW(dev))
-		return;
-
 	/* Program Tx lane resets to default */
 	mutex_lock(&dev_priv->dpio_lock);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),