brcmfmac: support BCM4365E with 43666 ChipCommon chip ID

This adds support for the BCM43666/4 which seems to be using the same
firmware as BCM4366 (4366c0). I found it in the Netgear R8000P router.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201214101553.32097-1-zajec5@gmail.com