rtlwifi: rtl8192c: rtl8192ce: rtl8192cu: rtl8192se: rtl8192de: Shorten some variable names

The private data areas for these drivers contain some very long variable
names that cause difficulty in fitting source lines to an 80-character
limit.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>