When changing the LED names for the Archer C7 to represent the correct color, a migration for existing UCI entries was not created. Add a migration to keep existing LED configurations working. Fixes commitc79c001b59("ar71xx: Archer C7 v1 LED names and RFKILL fixes") Signed-off-by: David Bauer <mail@david-bauer.net> (cherry picked from commit4349d4c682)