riscv: sifive_u: Add PRCI block to the SoC
Add PRCI mmio base address and size mappings to sifive_u machine, and generate the corresponding device tree node. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NAlistair Francis <alistair.francis@wdc.com> Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>
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