Bring _rtl92c_phy_iq_calibrate() in line with the vendor driver function _PHY_IQCalibrate().

Also fix incorrect initialisation for rtl8192cu.
Signed-of-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>