dt-bindings: serial: Add compatible for Qualcomm SA8797P SoC

dt-bindings: serial: Add compatible for Qualcomm SA8797P SoC

Document QUP GENI UART controller on Qualcomm Nord SA8797P SoC which is
compatible with SA8255P controller.

Signed-off-by: Deepti Jaggi <deepti.jaggi@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Shawn Guo <shengchao.guo@oss.qualcomm.com>
Link: https://patch.msgid.link/20260427010114.230341-1-shengchao.guo@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>