Description of problem:
"queue_mode mq" did not show in the output of "multipath -ll" when use_blk_mq and multipath.conf set properly. 

Version-Release number of selected component (if applicable):
[root@localhost ] cat /proc/version
Linux version 4.18.0-80.el8.x86_64 (mockbuild.eng.bos.redhat.com) (gcc version 8.2.1 20180905 (Red Hat 8.2.1-3) (GCC)) #1 SMP Wed Mar 13 12:02:46 UTC 2019

[root@localhost ]# rpm -qa | grep device-mapper
device-mapper-multipath-0.7.8-7.el8.x86_64
device-mapper-event-1.02.155-6.el8.x86_64
device-mapper-libs-1.02.155-6.el8.x86_64
device-mapper-multipath-libs-0.7.8-7.el8.x86_64
device-mapper-persistent-data-0.7.6-1.el8.x86_64
device-mapper-event-libs-1.02.155-6.el8.x86_64
device-mapper-1.02.155-6.el8.x86_64


How reproducible:
Easy to reproduce. 

Steps to Reproduce:
1. Install RHEL8, 
2. Zone and configure a nvme device to this host,
3, configure multipath.conf,
4, multipath -ll 
5, check if the output has "queue_mode mq"

[root@localhost ]cat /sys/module/scsi_mod/parameters/use_blk_mq
Y
[root@localhost ]# cat /sys/module/dm_mod/parameters/use_blk_mq
Y

[root@localhost ]# cat /etc/multipath.conf
##################################################################
# multipath.conf - generated by setup_host_multipath.pl
# The multipath.conf configuration file has been updated.
# the original configuration file was copied to /etc/multipath.conf.<TIME>.backup
#
devices {
    device {
        vendor "NVME"
        product "IBM\s+2145"
        path_grouping_policy "multibus"
        path_selector "round-robin 0"
        prio "const"
        path_checker "none"
        failback "immediate"
        no_path_retry "queue"
        rr_weight uniform
        rr_min_io_rq "1"
        fast_io_fail_tmo 15
        dev_loss_tmo 600
    }
    device {
        vendor "IBM"
        product "2145"
        path_grouping_policy "group_by_prio"
        path_selector "service-time 0"
        prio "alua"
        path_checker "tur"
        failback "immediate"
        no_path_retry 5
        rr_weight uniform
        rr_min_io_rq "1"
        dev_loss_tmo 120
    }
}
defaults {
    user_friendly_names yes
    path_grouping_policy group_by_prio
}



Actual results:
no "queue_mode mq"
mpathal (eui.c0000000000000200050760810ca0166) dm-7 NVME,IBM     2145
size=1.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  `- 0:161:5:5 nvme0n5 259:4 active ready running

Expected results:
has "queue_mode mq"
linux-u9qs:~ # multipath -ll
mpathd (eui.c00000000000002c0050760810ca0166) dm-2 NVME,IBM     2145
size=1.0G features='3 queue_if_no_path queue_mode mq' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=enabled
  |- 0:161:1:17 nvme0n1 259:0 active ready running
  `- 1:112:1:17 nvme1n1 259:1 active ready running


Additional info:
not yet.