BACKPORT: FROMGIT: scsi: ufs: core: Introduce HBA performance monitor sysfs nodes

Add a new sysfs group which has nodes to monitor data/request transfer
performance. This sysfs group has nodes showing total sectors/requests
transferred, total busy time spent and max/min/avg/sum latencies. This
group can be enhanced later to show more UFS driver layer performance
statistics data during runtime.

Link: https://lore.kernel.org/r/1619058521-35307-2-git-send-email-cang@codeaurora.org


Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Acked-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Bug: 190637035
(cherry picked from commit 1d8613a2
git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git

 5.14/scsi-staging)
[Can Guo: Resolved minor conflict in ufshcd.c]
Change-Id: Ibf5297304b2040bf2bb73131447a2a5916d95470
Signed-off-by: Can Guo <cang@codeaurora.org>