drm/panel: simple: Add support for Tianma TM070JDHG30

drm/panel: simple: Add support for Tianma TM070JDHG30

The Tianma TM070JDHG30 is a 7" LVDS display with a resolution of
1280x800.

	http://usa.tianma.com/products-technology/product/tm070jdhg30-00

You can also find this product along with a FT5x06 touch controller
from Boundary Devices:

	https://boundarydevices.com/product/bd070lic2/

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>