This adjusts sync values according to the datasheet

Fixes: 1c243751 ("drm/panel: ilitek-ili9881c: add support for Feixin K101-IM2BYL02 panel")
Co-developed-by: NMarius Gripsgard <marius@ubports.com>
Signed-off-by: NDan Johansen <strit@manjaro.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210818214818.298089-1-strit@manjaro.orgSigned-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>