UPSTREAM: of: Introduce of_translate_dma_region()

This function is similar to of_translate_dma_address() but also reads a
length in addition to an address from a device tree property.

Bug: 257546262
Reviewed-by: Rob Herring <robh@kernel.org>
Change-Id: I04eb9ee382b4a6db998b0bf34545f2bddef7a00e
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230120174251.4004100-2-thierry.reding@gmail.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>
(cherry picked from commit e251c213)