drm/amd/display: Tidy up dce120_timing_generator_enable_advanced_request()

Simplify the function by removing identical looking code blocks.
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c

@@ -669,31 +669,18 @@ void dce120_timing_generator_enable_advanced_request(
 				mmCRTC0_CRTC_START_LINE_CONTROL,
 				tg110->offsets.crtc);
 
-
-	if (enable) {
 	set_reg_field_value(
 		value,
-			0,
+		enable ? 0 : 1,
 		CRTC0_CRTC_START_LINE_CONTROL,
 		CRTC_LEGACY_REQUESTOR_EN);
-	} else {
-		set_reg_field_value(
-			value,
-			1,
-			CRTC0_CRTC_START_LINE_CONTROL,
-			CRTC_LEGACY_REQUESTOR_EN);
-	}
 
 	/* Program advanced line position acc.to the best case from fetching data perspective to hide MC latency
 	 * and prefilling Line Buffer in V Blank (to 10 lines as LB can store max 10 lines)
 	 */
 	if (v_sync_width_and_b_porch > 10)
-		set_reg_field_value(
-			value,
-			10,
-			CRTC0_CRTC_START_LINE_CONTROL,
-			CRTC_ADVANCED_START_LINE_POSITION);
-	else
+		v_sync_width_and_b_porch = 10;
+
 	set_reg_field_value(
 		value,
 		v_sync_width_and_b_porch,