dt-bindings: Add vendor prefix for Solomon Goldentek Display Corporation

Solomon Goldentek Display Corporation is a Taiwanese LCD/LCM manufacturer.
Company Site: http://www.goldentek.com.tw



Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>