Make XIRQ trigger configuration *programmable* #911
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add TTYP and TPOL registers
triggers are now programmable
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This PR removes the
XIRQ_TRIGGER_TYPEandXIRQ_TRIGGER_POLARITYgenerics which were used to configure the type (level or edge) and the polarity (low/high or rising/falling) of each XIRQ channel.They are replaced by two new XIRQ registers (
TTYPandTPOL) to allow online configuration (i.e. during runtime) of the trigger type for each XIRQ channel.