staging: rtl8192e: Remove unused variables nic_type and RxPower

Remove unused variables nic_type and RxPower as they are set and never
evaluated.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/96f8c089aefe6648dad0c68663211b375f016517.1708461563.git.philipp.g.hortmann@gmail.com


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