drm/panel: simple: push blanking limit on RK32FN48H

Push horizontal front porch and vertical back porch blanking limit.
This allows to get a 60 fps sharp.
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240205-ltdc_mp13-v1-5-116d43ebba75@foss.st.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240205-ltdc_mp13-v1-5-116d43ebba75@foss.st.com

drivers/gpu/drm/panel/panel-simple.c

@@ -3543,10 +3543,10 @@ static const struct display_timing rocktech_rk043fn48h_timing = {
 	.pixelclock = { 6000000, 9000000, 12000000 },
 	.hactive = { 480, 480, 480 },
 	.hback_porch = { 8, 43, 43 },
-	.hfront_porch = { 2, 8, 8 },
+	.hfront_porch = { 2, 8, 10 },
 	.hsync_len = { 1, 1, 1 },
 	.vactive = { 272, 272, 272 },
-	.vback_porch = { 2, 12, 12 },
+	.vback_porch = { 2, 12, 26 },
 	.vfront_porch = { 1, 4, 4 },
 	.vsync_len = { 1, 10, 10 },
 	.flags = DISPLAY_FLAGS_VSYNC_LOW | DISPLAY_FLAGS_HSYNC_LOW |