iommu/arm-smmu-qcom: Fix TTBR0 read

iommu/arm-smmu-qcom: Fix TTBR0 read

[ Upstream commit c31112fbd4077a51a14ff338038c82e9571dc821 ]

It is a 64b register, lets not lose the upper bits.

Fixes: ab5df7b953d8 ("iommu/arm-smmu-qcom: Add an adreno-smmu-priv callback to get pagefault info")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211108171724.470973-1-robdclark@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>