drm/i915/display: Remove FRL related code from disable DP sequence for older platforms

Remove code for resetting frl related members from intel_disable_dp, as
this is not applicable for older platforms.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210309043915.1921-3-ankit.k.nautiyal@intel.com

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

@@ -2419,8 +2419,6 @@ static void intel_disable_dp(struct intel_atomic_state *state,
 	intel_edp_backlight_off(old_conn_state);
 	intel_dp_set_power(intel_dp, DP_SET_POWER_D3);
 	intel_pps_off(intel_dp);
-	intel_dp->frl.is_trained = false;
-	intel_dp->frl.trained_rate_gbps = 0;
 }
 
 static void g4x_disable_dp(struct intel_atomic_state *state,