rtlwifi: Modify core routines

The rtlwifi core needs some changes before inclusion of a driver
for the RTL8192CU USB device.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by:  <chaoming_li@realsil.com.cn>
Signed-off-by:  <george0505@realtek.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>