riscv: remove CONFIG_RISCV_ISA_A
This option is always enabled, and not supporting the A extensions would create a complete ABI trainwreck, so there is no point in even slightly encouraging such an idea by keeping this unselectable code around. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>
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