Dali: Dali port P1x and P20x

Dali tx and rx are available for both P1 and P20. Switching between P1
and P20 provided.

Signed-off-by: Ajay <ajay@moxiedevices.com>
config parameters for Dali, UART and downstream tx rx fn

Signed-off-by: Ajay <ajay@moxiedevices.com>
added support of UART0

Signed-off-by: Ajay <ajay@moxiedevices.com>