🐛 Fix write access to mip.firq CSR bits #821
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Fixing #818
Write accesses to the
mipFIRQ CSR bits always impacted all FIRQ bits (making clearing/acknowledging a single FIRQ impossible). As a side-effect of this fix themip.firqbits are now read-write. Hence, software can trigger FIRQ manually by writing1to the according FIRQ bits.