Implement IMSIC and APLIC #1999
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AIA: add hgeie/hgeip CSRs
aia_ireg_proxy_csr_t ignores writes and reads 0 by default
Access to stopei and siselect of 0x70--0xff in S mode should raise an illegal instruction exception.
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Boots SMP Linux as kvm guest with VS IMSIC interrupts. Dependent on riscv/riscv-opcodes#354
@binno @glg-rv