RTEMS | bsps/riscv: Share the CLINT, PLIC and clock drivers (!1520)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/riscv/include/bsp/riscv-fdt-irq.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1520#note_160964

 > + *   indicates a processor without a CLINT index.
 > + */
 > +static inline uint32_t riscv_clint_get_index( uint32_t cpu_index )
 > +{
 > +  if ( cpu_index >= RISCV_FDT_PROCESSOR_MAXIMUM ) {
 > +    return UINT32_MAX;
 > +  }
 > +
 > +  return riscv_fdt_clint_index[ cpu_index ];
 > +}
 > +#endif
 > +
 > +/**
 > + * @brief This define indicates that the system may have no PLIC.
 > + */
 > +#define RISCV_PLIC_MAY_BE_ABSENT

should it be `MAY_BE_INVALID` here or use `MAY_BE_ABSENT` in the other two?

Should these defines be consolidated instead of spread among the helper functions?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1520#note_160964
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