dt-bindings: display: Add Sharp LS020B1DD01D panel documentation

The LS020B1DD01D is a 2.0" 240x160 16-bit TFT LCD panel.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603153120.23947-1-paul@crapouillou.net