mt76: mt76_connac: fix MCU_CE_CMD_SET_ROC definition error

Fixed an MCU_CE_CMD_SET_ROC definition error that occurred from a previous
refactor work.

Fixes: d0e274af ("mt76: mt76_connac: create mcu library")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>