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Some devices, such as the Raspberry Pi3, have a fixed offset between memory addresses as seen by the host and as seen by the other bus masters. So add a new PCD that allows this fixed offset to be recorded, and to be used when returning device addresses from the DmaLib mapping routines. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>