change rule names to allow implicit scheduling

change rule names to allow implicit scheduling

When inputs from multiple IO cells drive the same interface/peripheral there needs to be an implicite priority between the rules updating the same wire (going to the interface). The current pinmap in this commit creates the above scenario.
To enable the implicit scheduling the rules names need to be different. This commit ensures this as well
Also currently the ordering is based on the order in which the user provides the two instances. the first instance os uart_rx is given priority over the later instance in the pinmap.txt file.