dt: amd-seattle: add a description of the PCIe SMMU

Add a description of the SMMU that covers the PCIe host bridge
on AMD Seattle.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Ard Biesheuvel 2019-12-03 15:23:03 +00:00 • committed by Arnd Bergmann
commit dd5c160655
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