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.

Change-Id: Icfeef0e6aaed064b456fac1cd5531fff1328ae37
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>