be2iscsi: Use macros for MCC WRB and CQE fields

Rename mcc_numtag to mcc_tag_status.  MCC CQE status is processed using
macros already defined in be_cmds.h.

Add MCC_Q_WRB_ and MCC_Q_CMD_TAG_MASK macros to map to already defined
CQE_STATUS_ macros to be consistent when posting MCC.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>