dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel

This patch adds documentation of device tree bindings for the WVGA panel
Ampire AM-480272H3TMQW-T01H.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>