staging: rtl8192e: Rename LastRxDescTSF, LoopbackMode and pFirmware

Rename variable LastRxDescTSF to last_rx_desc_tsf, LoopbackMode to
loopback_mode and pFirmware to fw_info 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/d6c77644d5602ad6e5b4889336a1a4700401321d.1674071236.git.philipp.g.hortmann@gmail.com


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