[Qemu-riscv] RISC-V: qemu should provide different "model" strings in DT for RV64 and RV32

[Karsten Merker]

Hello,

while working on RISC-V support for the Debian flash-kernel package
I have stumbled over a potential problem with the "model" string
that qemu sets in the DT that it generates for the "virt" machine,
namely "riscv-virtio,qemu".

Some tools, among them flash-kernel, use the "model" string to
determine on which specific type of hardware they are running and
perform corresponding hardware-specific actions.  It looks like
qemu uses the same model string for both RV64 and RV32, which
makes it impossible to differentiate between the two. I would
therefore like to propose to make the model-string
XLEN-dependent, i.e. "riscv64-virtio,qemu" respectively
"riscv32-virtio,qemu".

Regards,
Karsten
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