fpga: m10bmc-sec: switch show_canceled_csk() to using sysfs_emit()

Switch show_canceled_csk() to use the proper sysfs_emit("%*pbl").

Reviewed-by: Russ Weight <russ.weight@linux.dev>
Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Yury Norov <ynorov@nvidia.com>
[ Yilun: Remove unnecessary header file ]
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20260303200842.124996-6-ynorov@nvidia.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>