drm/i915: s/IS_G4X && !IS_GM45/IS_G45/

We have IS_G45 these days. Let's use it instead of the
'IS_G4X && !IS_GM45' construct.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180614180500.2565-1-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_crt.c

@@ -517,7 +517,7 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 	 * to get a reliable result.
 	 */
 
-	if (IS_G4X(dev_priv) && !IS_GM45(dev_priv))
+	if (IS_G45(dev_priv))
 		tries = 2;
 	else
 		tries = 1;

drivers/gpu/drm/i915/intel_dp.c

@@ -6421,7 +6421,7 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	 * 0xd.  Failure to do so will result in spurious interrupts being
 	 * generated on the port when a cable is not attached.
 	 */
-	if (IS_G4X(dev_priv) && !IS_GM45(dev_priv)) {
+	if (IS_G45(dev_priv)) {
 		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 	}

drivers/gpu/drm/i915/intel_hdmi.c

@@ -2341,7 +2341,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 	 * 0xd.  Failure to do so will result in spurious interrupts being
 	 * generated on the port when a cable is not attached.
 	 */
-	if (IS_G4X(dev_priv) && !IS_GM45(dev_priv)) {
+	if (IS_G45(dev_priv)) {
 		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 	}