staging: rtl8192e: Rename SelfMimoPs, CurrentOpMode and bForcedShortGI

Rename variable SelfMimoPs to self_mimo_ps, CurrentOpMode to
current_op_mode and bForcedShortGI to forced_short_gi 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/4c59f62a95b9a77711284998b98fbc559b8db813.1664055213.git.philipp.g.hortmann@gmail.com


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