staging: rtl8192e: Rename Record_CCK_2.., Record_CCK_4.. and DefaultIn..

Rename variable Record_CCK_20Mindex to rec_cck_20m_idx,
Record_CCK_40Mindex to rec_cck_40m_idx and DefaultInitialGain to
def_initial_gain 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/2963e704afae2382bb7fded0453adbc4a8d48db3.1673812849.git.philipp.g.hortmann@gmail.com


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