scsi: dt-bindings: ufs-cdns: Update Cadence UFS compatibility list

This patch adds a new compatible string description for CDNS UFS HCD + M31
16nm PHY.

Signed-off-by: Jan Kotas <jank@cadence.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>