Metaknight: Remove legacy board
This removes the last remaining reference to metaknight_light. We
already removed the board.
BRANCH=None
TEST=buildall passes
CHIP:=npcx
CHIP_FAMILY:=npcx7
-# A limited metaknight_legacy boards are reworked with NPCX796FC variant.
-# Set the modify the variant type to match.
-ifeq ($(BOARD),metaknight_legacy)
-CHIP_VARIANT:=npcx7m6fc
-else
CHIP_VARIANT:=npcx7m7fc
-endif
BASEBOARD:=dedede
board-y=board.o battery.o led.o usb_pd_policy.o
