dt-bindings: qcom: geni-se: Update UART schema reference

We now have geni based QUP UART controller individual binding, update
reference in parent schema and remove properties from common wrapper.

With removal of last child node schema, remove common properties of all
the controllers as they have become obsolete now.

Signed-off-by: Kuldeep Singh <singh.kuldeep87k@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220404182938.29492-5-singh.kuldeep87k@gmail.com