There are certain bsg commands which need to be completed by the driver
without involving firmware. These requests are termed driver commands. Add
support for these.

Link: https://lore.kernel.org/r/20220429211641.642010-3-sumit.saxena@broadcom.com
Reported by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: Nkernel test robot <lkp@intel.com>
Reviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>