staging: rtl8192e: Rename eRFPowerState, eRfOff and eRfOn

Rename variable eRFPowerState to rf_power_state, eRfOff to rf_off and
eRfOn to rf_on to avoid CamelCase which is not accepted by checkpatch.
Omit the upfront "e" as no RFPowerState, RfOff and RfOn exist and it
makes the variables unnecessary long.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/52c676bbaf1f894e30971c5c409b4bcb71c8ef7e.1664055213.git.philipp.g.hortmann@gmail.com


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