staging: rtl8192e: Remove unused variable rfintfi

Remove unused variable rfintfi because it is just once set and not used.
Remove unused constants as well.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/f251186fe59855eee3dd465954700a1d0ec50f53.1678569965.git.philipp.g.hortmann@gmail.com


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