brcmsmac: remove duplicated bit-wise or of IEEE80211_CHAN_NO_IR

Bit pattern IEEE80211_CHAN_NO_IR is being bit-wise or'd twice;
remove the redundant 2nd IEEE80211_CHAN_NO_IR

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>