scsi: fcoe: make fcoe_e_d_tov and fcoe_r_a_tov static

These module parameter variables don't need global scope, make them
static

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>