Feature: show which flash is active on the web UI

[bluecmd]

It would be neat to have an indicator showing which flash partition is active on the vedge

Would likely need to add it to the system.board call to surface it to the dashboard.

Until then, one can check if it's the primary or secondary bank using sudo awk '/^0a/ {print $2 == "02"}' /sys/kernel/debug/regmap/dummy-cpld@0x000000001e000000/registers (0 = primary, 1 = secondary)