scsi: ufs: bsg: Remove unnecessary length checkup

Remove checks on job->request_len and job->reply_len because msgcode checks
in a subseqent commit will rule out malicious requests.

Signed-off-by: Bean Huo <beanhuo@micron.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>