drm/i915: Nuke pre-production GLK HDMI w/a 1139

w/a #1139 is only needed for pre-production GLK. Nuke it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200128155152.21977-1-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>

drivers/gpu/drm/i915/display/intel_hdmi.c

@@ -2275,11 +2275,6 @@ static bool hdmi_deep_color_possible(const struct intel_crtc_state *crtc_state,
 		}
 	}
 
-	/* Display WA #1139: glk */
-	if (bpc == 12 && IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&
-	    adjusted_mode->htotal > 5460)
-		return false;
-
 	/* Display Wa_1405510057:icl */
 	if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
 	    bpc == 10 && INTEL_GEN(dev_priv) >= 11 &&