wifi: rtlwifi: rtl8192se: Remove some unused variables

wifi: rtlwifi: rtl8192se: Remove some unused variables

Variables bcntime_cfg, bcn_cw and bcn_ifs are not effectively used, so
delete them.

drivers/net/wireless/realtek/rtlwifi/rtl8192se/hw.c:1555:6: warning: variable 'bcntime_cfg' set but not used.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4240
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230302023911.59278-1-jiapeng.chong@linux.alibaba.com