Platform/Overdrive: clean up stream ID descriptions in DT

Align the DT description of the SMMU topology and stream IDs with the
actual routing of the SoC. As with the preceding IORT change, this is
mostly a cleanup exercise, but it does actually fix an issue with the
CCP crypto accelerator on B1 silicon.

Since the CCP shares its SMMU with the second SATA controller, which
is only enabled on B1 silicon, we can drop the logic that disables
this SMMU on B0 silicon or on platforms that do not expose any SATA
ports on the second controller (such as the Cello).

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Leif Lindholm <leif.lindholm@linaro.org>