wil6210: fix L2 RX status handling

L2 RX status errors should not be treated as a bitmap and the actual
error values should be checked.
Print L2 errors as wil_err_ratelimited for easier debugging
when such errors occurs.

Change-Id: I388fada7be9c40b8549ea0e44b249a12f41e9e35
Signed-off-by: Maya Erez <merez@codeaurora.org>