staging: rtl8192e: Remove variable stats->freq as it is constant

stats->freq is initialized with 1 and then unchanged. All evaluations
will result accordingly. Remove resulting dead code and unused defines.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/4d8801d37889e6af4f43dff10d1426fc7918f562.1687007788.git.philipp.g.hortmann@gmail.com


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