staging: rtl8192e: Remove DefaultKey from rtl92e_set_swcam

Function rtl92e_set_swcam() has parameter DefaultKey which is in all calls
0. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/9390014fe045028ac2a32ce7c9745c7cddbd4adf.1690615475.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>