wl1271: remove workaround to ignore -EIO from radio and general params

We were ignoring the -EIO return value from wl1271_cmd_radio_params() and
wl1271_cmd_general_params(), because they were always returning an error and
we didn't know why.  Now this has been fixed, so the workaround can be
removed.

Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>