staging: rtl8192e: Rename variable LowRSSIThreshForRA

Rename variable LowRSSIThreshForRA to low_rssi_thresh_for_ra to avoid
CamelCase which is not accepted by checkpatch.

Signed-off-by: Yogesh Hegde <yogi.kernel@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/ebea3e75dc84a6d77750c0598ab12d04ad55c676.1688299890.git.yogi.kernel@gmail.com


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