iommupt: Add the RISC-V page table format

iommupt: Add the RISC-V page table format

The RISC-V format is a fairly simple 5 level page table not unlike the x86
one. It has optional support for a single contiguous page size of 64k (16
x 4k).

The specification describes a 32-bit format, the general code can support
it via a #define but the iommu side implementation has been left off until
a user comes.

Tested-by: Vincent Chen <vincent.chen@sifive.com>
Acked-by: Paul Walmsley <pjw@kernel.org> # arch/riscv
Reviewed-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Tested-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>