scsi: ufs: add support for UFS HCI 2.1

The UFS HCI v2.1 includes a few additional registers. This change
updates the HCI register, the UFS version register content and the
Interrupt Status register.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>