Currently multi-cam application only supports consecutive channel mask and channel mask is calculated based on the num of cam enabled (i.e. 2 cam means ch_mask - 0x3)  

When 2 cam connected at any ports are provided (i.e. ch_mask - 0x11), two changes has to be done additionally to the application.

1. manually change ch_mask to 0x11 after the API app_querry_sensor()
2. Modify the starting channel parameter in app_init_aewb() to take the respective ports as starting channel.

This should be automatically done by the application based on the port the cam is connected in.