A set of fixes for interrupt chip drivers:

 - Fix the fallout of the IPI as interrupt conversion in Kconfig and the
   BCM2836 interrupt chip driver/

 - Fixes for interrupt affinity setting and the handling of hierarchical
   irq domains in the SiFive PLIC driver.

 - Make the unmapped event handling in the TI SCI driver work correctly.

 - A few minor fixes and cleanups in various chip drivers and Kconfig.
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