iommu/arm-smmu: Make all valid stream mappings BYPASS

Turn all stream mappings marked as valid into BYPASS. This allows the
platform specific implementation to configure stream mappings to match
the boot loader's configuration for e.g. display to continue to function
through the reset of the SMMU.

Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Message-Id: <20200709050145.3520931-2-bjorn.andersson@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>