Staging: silicom: Fixed warning 'preferred seq_puts instead of seq_printf'.

This patch fixes warning in silicom/bpctl_mod.c : seq_puts has to be preferred
to seq_printf when the format is a constant string.

Signed-off-by: Tülin İzer <tulinizer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>