drm/panel: simple: Add more properties to Innolux G121I1-L01

Convert from a single mode to display timings, which allow to describe
the minimum/maximium blanking and clock rates, add enable/disable delays
and provide the bus format.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>