staging: rtl8192e: Remove repeated set to zero of powerlevel and friend

Variables powerlevel and powerlevelOFDM24G are initialized to zero and
unchanged. No reason to set them to zero again. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/50f28816aa006821d3e3a8346e39ae68c4d53963.1674244819.git.philipp.g.hortmann@gmail.com


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