BACKPORT: FROMLIST: iommu/arm-smmu-v3-kvm: Initialize page table configuration

Prepare the stage-2 I/O page table configuration that will be used by
the hypervisor driver.

Link: https://lore.kernel.org/kvmarm/20230201125328.2186498-40-jean-philippe@linaro.org/

(cherry picked from commit d4f94d6c3d5d89405a5299fd74e5d2c03940327b
https://jpbrucker.net/git/linux/log/?h=pkvm/smmu

)

Bug: 277989609
Bug: 278749606
Change-Id: I8af289501707e394d91175b6955eb7e2ac51c73f
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>