irqchip: riscv: s64ilp32: Use __riscv_xlen instead of CONFIG_32BIT
When s64ilp32 enabled, CONFIG_32BIT=y but __riscv_xlen=64. So we must use __riscv_xlen to detect real machine XLEN for CSR access. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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