RISC-V: validate riscv,isa at boot, not during ISA string parsing

Since riscv_fill_hwcap() now only iterates over possible cpus, the
basic validation of whether riscv,isa contains "rv<width>" can be moved
to riscv_early_of_processor_hartid().

Further, "ima" support is required by the kernel, so reject any CPU not
fitting the bill.

Reviewed-by: Andrew Jones <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Reviewed-by: Sunil V L <[email protected]>
Link: https://lore.kernel.org/r/20230607-guts-blurry-67e711acf328@spud
Signed-off-by: Palmer Dabbelt <[email protected]>

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