staging: rtl8192e: Rename variable targetRATR

Rename variable targetRATR to target_ratr 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/ef60d870d643a3774363efdac798e059ea5b8f85.1688299890.git.yogi.kernel@gmail.com


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