Use the default timing parameters to get a refresh rate of about 60 Hz for
a clock of 6 MHz.

Fixes: 0fbbe96b ("drm/panel: sitronix-st7789v: add jasonic jt240mhqs-hwt-ek-e3 support")
Signed-off-by: Gerald Loacker <gerald.loacker@wolfvision.net>
Acked-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Link: https://lore.kernel.org/r/20240409-bugfix-jt240mhqs_hwt_ek_e3-timing-v2-2-e4821802443d@wolfvision.netSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409-bugfix-jt240mhqs_hwt_ek_e3-timing-v2-2-e4821802443d@wolfvision.net