staging: rtl8192e: Rename diff_TH and disabledRF

Rename variables diff_TH to diff_th and disabledRF to disabled_rf to
avoid CamelCase which is not accepted by checkpatch.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/2b95586ed460f90c98721a429aced1ffaf258e49.1675792435.git.philipp.g.hortmann@gmail.com


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