dt-bindings: serial: Add a new compatible string for ums9632

The UMS9632 uses the SC9632 serial device.

Signed-off-by: Wenhua Lin <Wenhua.Lin@unisoc.com>
Link: https://lore.kernel.org/r/20241113110516.2166328-3-Wenhua.Lin@unisoc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>