Staging: rtl8187se: Remove card8185 variable to simplify flow

When this code is used for the rtl8187se, the value of card_8185
in struct r8180_priv is always 7 or 8. As a result, the program
flow can be simplified.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: Bernhard Schiffner <bernhard@schiffner-limbach.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>