staging: rtl8192e: Rename variable SetBWModeHandler

Rename variable SetBWModeHandler to set_bw_mode_handler to avoid
CamelCase which is not accepted by checkpatch.

Signed-off-by: Yogesh Hegde <yogi.kernel@gmail.com>
Link: https://lore.kernel.org/r/fe6c16cfe1d8f7ff41b5fce90fc63383fbfec4f5.1687183827.git.yogi.kernel@gmail.com


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