drm/i915: s/i9xx_/gm45_ for the gm45 write_infoframe function

Generally we call stuff with i9xx_ when it's valid for gen3+. But
gen3 and early gen4 only support hdmi with sdvo cards, and writing
infoframes works completely different there.

v2: Use g4x instead of gm45 - it applies to the desktop variant, too.

v3: Properly align the paramters of g4x_write_infoframe again, noticed
by Paulo Zanoni.
Acked-by: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_hdmi.c

@@ -113,7 +113,7 @@ static u32 intel_infoframe_enable(struct dip_infoframe *frame)
 	return flags;
 }
 
-static void i9xx_write_infoframe(struct drm_encoder *encoder,
+static void g4x_write_infoframe(struct drm_encoder *encoder,
 				struct dip_infoframe *frame)
 {
 	uint32_t *data = (uint32_t *)frame;
@@ -654,7 +654,7 @@ void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 	intel_hdmi->sdvox_reg = sdvox_reg;
 
 	if (!HAS_PCH_SPLIT(dev)) {
-		intel_hdmi->write_infoframe = i9xx_write_infoframe;
+		intel_hdmi->write_infoframe = g4x_write_infoframe;
 		I915_WRITE(VIDEO_DIP_CTL, 0);
 	} else if (IS_VALLEYVIEW(dev)) {
 		intel_hdmi->write_infoframe = vlv_write_infoframe;