Add maximum bare-board power consumption to table

[clark800]

The power consumption table here shows "Typical bare-board active current consumption", but it would also be helpful to know the "maximum bare-board current consumption".

The recommended power supply numbers in the table seem to be padded to accommodate peripherals, which means there is currently no reliable way to determine if a smaller power supply would be sufficient for a particular use case, such as a headless server with no peripherals. Knowing the "maximum bare-board current consumption" would allow users to calculate an optimal power supply by adding this number to the current consumption required for their particular peripheral setup.

The "stress" numbers in the following table give some indication, but they don't currently cover all models, they aren't bare-board numbers, and it's not clear if they are maximal in the sense of full utilization of all cores plus WiFi plus bluetooth etc simultaneously.