Add node to support the QUP UART6 controller inside of IPQ8074.
Used by some routers to communicate with a Bluetooth controller.
Signed-off-by: Paweł Owoc <frut3k7@gmail.com>
Link: https://lore.kernel.org/r/20240229205426.232205-1-frut3k7@gmail.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>