drm/panel: khadas-ts050: update timings to achieve 60Hz refresh rate

This updates the panel timings to achieve a clean 60Hz refresh rate.

Reviewed-by: Nicolas Belin <nbelin@baylibre.com>
Tested-by: Nicolas Belin <nbelin@baylibre.com> # on Khadas VIM3 + TS050 Panel
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512-amlogic-v6-4-upstream-dsi-ccf-vim3-v5-13-56eb7a4d5b8e@linaro.org