dt-bindings: display: himax-hx8394: Add Huiling hl055fhav028c

Add compatible string for the Huiling hl055fhav028c. This panel is
based on the Himax HX8399C display controller which is extremely
similar to the existing HX8394. Add a new constant for
himax,hx8399c for this new display controller as well.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250603193930.323607-3-macroalpha82@gmail.com