rtlwifi: rtl8192cu: Add routine hw

Add the routine rtlwifi/rtl8192cu/hw.c. This one is distinct from the
routine of the same name in rtl8192ce.
Signed-off-by: NGeorge <george0505@realtek.com>
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>