wil6210: set L2 translation mode to eth mode

ETH mode is a new flavor in OFUL2 to fix vlan/snap insertion.
Enable ETH mode by setting L2 translation type to 0x3.

Change-Id: I7f01c13400f7f66d3bc1fb1419ac5e0bd57909d4
Signed-off-by: Maya Erez <merez@codeaurora.org>