rtlwifi_new: Add 5G capability early

If the device has a 5G radio, it needs to be known before mac80211 is initialized.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtlwifi_new: Fix "test is always true" warning

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>